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Created: 14.7.2026
Updated: 21.7.2026

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Biography
Tsvetan Borissov Georgiev

Donation

Born

Education

He studied physics at the Sofia University (1975)

He was PhD student in the area of astronomy at the Bulgarian Academy of Sciences (1987) and ScD by the Russian Academy of Sciences (1997)

He specialized 4 years in Russia and 1,5 years in Germany (1997-2004)

Profesional Experiance

At the BAS Institute of Astronomy and National Astronomical Observatory he was assistant (1981-1997), asociate professor (1997-2009) and professor (2009-2010)

He worked in the Rozhen Nacional Astronomical Observatory (20 godini)

Ts. Georgiev was professor at the New Bulgarian University from 2010

Research

Galaxy, cosmology, structure, and evolution of stellar systems are areas of his research

Publications in Latin Alphabet

  1. Ts. B. Georgiev, A. Valcheva, P. Nedialkov, S. Stefanov, M. Moyseev, Periodicity in the historical light curve of the LBV star n Carinae, Bulgarian Astronomical Journal, Vol. 43, p. 3 (2025)

  2. Ts. Georgiev, S. Simeonova, L. Dankova, On the Delay of the Additional Mortality Linked to the Geomagnetic Disturbances, Aerospace Research in Bulgaria, vol. 36, pp. 51-66 (2024)

  3. Ts. Georgiev, Revealing of repeating structures in time series by the structure length eminence, Bulgarian Astronomical Journal, Vol. 38, p. 120 (2023)

  4. Ts. Georgiev, R. Zamanov, S. Stefanov, Macro-flickering of AQ Mensae on the daily time-scales: Parameters and quasi-period modes, Bulgarian Astronomical Journal, Vol. 38, p. 68 (2023)

  5. Ts. Georgiev, S. Boeva, K. Stoyanov, G. Latev, B. Spassov, A. Kurtenkov, Intra-night flickering of MWC 560: Parameters and quasi-period modes. Comparison with RS Oph and T CrB, Bulgarian Astronomical Journal, Vol. 37, p. 62 (2022)

  6. Ts. Georgiev, R. Zamanov, S. Boeva, G. Latev, B. Spassov, J. Martн, G. Nikolov, S. Ibryamov, S. Tsvetkova, K. Stoyanov, Intra-night flickering of RS Ophiuchi: IV. Shapes of repeating time structures and their evolution, Bulgarian Astronomical Journal, Vol. 34, p. 55 (2021)

  7. Ts. Georgiev, R. Zamanov, S. Boeva, G. Latev, B. Spassov, J. Martн, G. Nikolov, S. Ibryamov, S. Tsvetkova, K. Stoyanov, Intra-night flickering of RS Ophiuchi: III. Modes of quasi-periods in the minute scale and their evolution, Bulgarian Astronomical Journal, Vol. 33, p. 3 (2020)

  8. Ts. Georgiev, R. Zamanov, S. Boeva, G. Latev, B. Spassov, J. Martн, G. Nikolov, S. Ibryamov, S. Tsvetkova, K. Stoyanov, Intra-night flickering of RS Ophiuchi: II. Exponentially distributed quasi-period modes, Bulgarian Astronomical Journal, Vol. 32, p. 35 (2020)

  9. Ts. Georgiev, R. Zamanov, S. Boeva, G. Latev, B. Spassov, J. Martн, G. Nikolov, S. Ibryamov, S. Tsvetkova, K. Stoyanov, Intra-night flickering of RS Ophiuchi: I. Sizes and cumulative energies of time structures, Bulgarian Astronomical Journal, Vol. 30, p. 83 (2019)

  10. Ts. Georgiev, Correlations of parameters of Titius-Bode law with parameters of exoplanet and satellite systems, Bulgarian Astronomical Journal, Vol. 29, p. 19 (2018)

  11. Ts. Georgiev, Titius-Bode law in the Solar System. Dependence of the regularity parameter on the central body mass, Bulgarian Astronomical Journal, Vol. 25, p. 3 (2016)

  12. Ts. Georgiev, Deep photometry and integral magnitudes of 8 nearby galaxies, AIP Conference Proceedings, Volume 1714, Issue 1, id.020005 (2016)

  13. Ts. Georgiev, P. Nedialkov, E. Ovcharov, A. Valcheva, On the mutual location of the nearby galaxies M31, M32 and M110, Bulgarian Astronomical Journal, Vol. 23, p. 31 (2015)

  14. Ts. Georgiev, Graphic presentation of the simplest statistical tests, Bulgarian Astronomical Journal, Vol. 20, p. 14 (2014)

  15. Ts. Georgiev, Analysis of stellar variability based on polynomial fittings of its light curve, In: Space Plasma Physics, Proceedings of the 4th School and Workshop on Space Plasma Physics. AIP Conference Proceedings, Volume 1551, pp. 98-106 (2013)

  16. J. Concejo, O. Stanchev, Ts. Georgiev, The disk(s) of the Milky Way, SPACE PLASMA PHYSICS: Proceedings of the 4th School and Workshop on Space Plasma Physics. AIP Conference Proceedings, Volume 1551, pp. 72-83 (2013)

  17. Ts. Georgiev, Modified Fisher's and Student's tests for detection of faint stellar variability, Bulgarian Astronomical Journal, Vol. 18, No. 3, p. 97 (2012)

  18. Ts. Georgiev, A. Antov, R. Bachev, S. Boeva, G. Latev, B. Spasov, K. Stoyanov, S. Tsvetkova, Fractal morphology of the flickering of the cataclysmic variable star KR Aurigae, Bulgarian Astronomical Journal, Vol. 18, No. 2, p. 36 (2012)

  19. Ts. Georgiev, Four-Component Modeling of Brightness Profiles of Spiral Galaxies and Model Total Magnitudes, 3rd School and Workshop on Space Plasma Physics, AIP Conference Proceedings, Volume 1356, pp. 50-59 (2011)

  20. S. Boeva, R. Bachev, S. Tsvetkova, K. Stoyanov, R. Zamanov, B. Spassov, G. Latev, B. Petrov, Z. Donchev, D. Dimitrov, A. Valcheva, Ts. Georgiev, Flickering amplitude of the cataclysmic variable star MV Lyrae in different states, Bulgarian Astronomical Journal, Vol. 16, p. 23 (2011)

  21. E. Ovcharov, A. Valcheva, K. Stoyanov, A. Lalova, A. Kostov, Y. Nikolov, Ts. Georgiev, P. Nedialkov, Optical Nova Candidate in M31, The Astronomer's Telegram, No.3128 (2011)

  22. R. Bachev, S. Boeva, Ts. Georgiev, G. Latev, B. Spassov, K. Stoyanov, S. Tsvetkova, On the nature of the short-term variability of the cataclysmic binary star KR Aurigae, Bulgarian Astronomical Journal, Vol. 16, p. 31 (2011)

  23. F. Petkova, G. Borisov, Ts. Georgiev, L. Ilchev, V. Kalinova, P. Nedialkov, I. Parov, First observations with the radio telescope SRT in the Observatory of the Sofia University, Bulgarian Astronomical Journal, Vol. 14, p. 118 (2010)

  24. L. Vassileva, T. Veltchev, Ts. Georgiev, P. Nedialkov, Young stellar groups in M 33 galaxy: delineation and main parameters, Proc. VI Serbian-Bulgarian Astronomical Conference, Belgrade 7-11 May 2008, Eds. M. S. Dimitrijevich, M. Tsvetkov, L. C. Popovich, V. Golev, Publ. Astr. Soc. Rudjer Boshkovich (9) 433-440 (2009)

  25. L. Bukowiecki, G. Maciejewski, W. Bykowski, Ts. Georgiev, S. Boeva, N. Kacharov, B. Mihov, G. Latev, E. Ovcharov, A. Valcheva, Search For Variable Stars in the Field of The Young Open Cluster NGC 957, Open European Journal on Variable Stars, vol. 112, p.1 (2009)

  26. R. Bachev, D. Grupe, S. Boeva, E. Ovcharov, A. Valcheva, E. Semkov, Ts. Georgiev, L. Gallo, Studying X-ray reprocessing and continuum variability in quasars: PG 1211+143, Monthly Notices of the Royal Astronomical Society, Volume 399, Issue 2, pp. 750-761 (2009)

  27. E. Ovcharov, A. Valcheva, Ts. Georgiev, A. Kostov, Y. Nikolov, P. Nedialkov, Optical Nova Candidate in M31, The Astronomer's Telegram, No.2176 (2009)

  28. G. Maciejewski, B. Mihov, Ts. Georgiev, The open cluster Berkeley 53, Astronomische Nachrichten, Vol.330, Issue 8, p. 851 (2009)

  29. A. Valcheva, E. Ovcharov, Y. Nikolov, G. Latev, A. Kostov, Ts. Georgiev, P. Nedialkov, Optical Nova Candidate in M31, The Astronomer's Telegram, No.2090 (2009)

  30. O. Stanchev, Ts. Georgiev, K. Weis, D. Bomans, R-J. Dettmar, Correlation between the Convexity of the Disk Radial Profile and the Hubble Type of the Galaxy, In: Space Plasma Physics, School of Space Plasma Physics. AIP Conference Proceedings, Volume 1121, pp. 61-70 (2009)

  31. E. Ovcharov, A. Valcheva, A. Kostov, G. Latev, Y. Nikolov, Ts. Georgiev, P. Nedialkov, Optical Nova Candidate in M31, The Astronomer's Telegram, No.1927 (2009)

  32. A. Valcheva, E. Ovcharov, V. Ivanov, P. Nedialkov, I. Stanev, Long-term R-band monitoring of the z~0.8 QSO SDSS J075448.86+303355.1. First results, Bulgarian Astronomical Journal, Vol. 11, p. 71 (2009)

  33. G. Maciejewski, L. Bukowiecki, T. Brozek, Ts. Georgiev, S. Boeva, N. Kacharov, B. Mihov, G. Latev, E. Ovcharov, A. Valcheva, Variable stars in the field of the open cluster NGC 457, Information Bulletin on Variable Stars, No. 5864, #1 (2008)

  34. A. Valcheva, E. Ovcharov, G. Latev, A. Kostov, Y. Nikolov, Ts. Georgiev, P. Nedialkov, Optical Nova Candidate in M31, The Astronomer's Telegram, No. 1687 (2008)

  35. E. Ovcharov, P. Nedialkov, A. Valcheva, V. Ivanov, N. Tikhonov, I. Stanev, A. Kostov, Ts. Georgiev, Optical monitoring of the z = 4.40 quasar Q2203+292, Monthly Notices of the Royal Astronomical Society, Volume 386, Issue 2, pp. 819-825 (2008)

  36. G. Maciejewski, S. Boeva, Ts. Georgiev, B. Mihov, E. Ovcharov, A. Valcheva, A. Niedzielski, Photometric Study of Open Clusters NGC 2266 and NGC 7762, Baltic Astronomy, Vol. 17, p. 51-65 (2008)

  37. E. Ovcharov, A. Valcheva, A. Kostov, Y. Nikolov, Ts. Georgiev, P. Nedialkov, Two possible Novae in M31, The Astronomer's Telegram, No.1312 (2007)

  38. E. Ovcharov, A. Valcheva, V. Ivanov, N. Kacharov, A. Kostov, Y. Nikolov, Ts. Georgiev, P. Nedialkov, Probable nova in M31, The Astronomer's Telegram, No.1267 (2007)

  39. E. Ovcharov, A. Valcheva, A. Kostov, Y. Nikolov, I. Stanev, Ts. Georgiev, P. Nedialkov, M31 Nova Candidate, The Astronomer's Telegram, No. 1139 (2007)

  40. E. Ovcharov, Y. Nikolov, Ts. Georgiev, A. Valcheva, I. Stanev, A. Kostov, P. Nedialkov, M31 Nova Candidate, The Astronomer's Telegram, No. 973 (2006)

  41. L. Ilchev, I. Parov, A. Yanev, V. Ranev, P. Nedialkov, Ts. Georgiev, Steps toward development of radioastronomy in Bulgaria, Bulgarian Astronomical Journal, Vol. 8, p. 125 (2006)

  42. Ts. Georgiev, O. Stanchev, B. Deshev, I. Yankulov, P. Nedialkov, Studies of convex radial profiles of galactic disks, Bulgarian Astronomical Journal, Vol. 8, p. 39 (2006)

  43. E. Ovcharov, A. Kostov, I. Stanev, Ts. Georgiev, P. Nedialkov, Nova in M31, The Astronomer's Telegram, No.651 (2005)

  44. E. Ovcharov, N. Koleva, A. Kostov, A. Valcheva, I. Stanev, Ts. Georgiev, P. Nedialkov, Brightened Mira-Like Variable in M31, The Astronomer's Telegram, No.606 (2005)

  45. O. Stanchev, P. Nedialkov, Ts. Georgiev, I. Georgiev, Calibration of diameter-HI line width relation for edge-on spiral galaxies, Publications of the Astronomical Society Rudjer Boskovic, Vol. 5, p. 281 (2005)

  46. Ts. Georgiev, O. Stanchev, Decomposition of profiles of galaxies with convex disk shapes, Publications of the Astronomical Society "Rudjer Boskovic", Vol. 5, p. 175 (2005)

  47. Ts. Georgiev, I. Georgiev, N. Koleva, P. Nedialkov, O. Stanchev, Decomposition of the profiles of 20 galaxies, Aerospace Research in Bulgaria No. 20, p. 145 - 152 (2005). In: Balkan Astronomical Meeting, BAM 2004, 14-18 June 2004, Rozhen, Bulgaria

  48. Ts. Georgiev, I. Georgiev, N. Koleva, P. Nedialkov, O. Stanchev, Analysis of the color-magnitude diagrams of the dwarf galaxies UGCA 105 and UGCA 86, Aerospace Research in Bulgaria (ISSN 0861-1432), No. 20, p. 138 - 144 (2005). In: Balkan Astronomical Meeting, BAM 2004, 14-18 June 2004, Rozhen, Bulgaria

  49. L. Tzenev, E. Ovcharov, I. Stanev, Ts. Georgiev, I. Georgiev, P. Nedialkov, Nova in M31, The Astronomer's Telegram, No.346 (2004)

  50. L. Tzenev, I. Georgiev, E. Ovcharov, I. Stanev, A. Kostov, Ts. Georgiev, P. Nedialkov, Nova Near the Center of M31, The Astronomer's Telegram, No.334 (2004)

  51. L. Tzenev I. Georgiev, E. Ovcharov, I. Stanev, Ts. Georgiev P. Nedialkov, Nova in M31, The Astronomer's Telegram, No.330 (2004)

  52. Ts. Georgiev, D. Bomans, BVR photometry of the resolved dwarf galaxy Ho IX, Astronomy and Astrophysics, v.423, p.87-95 (2004)

  53. O. Stanchev, P. Nedialkov, Ts. Georgiev, A Hubble Diagram from 37 Southern Edge-on Spiral Galaxies in B and I Bands, Comptes Rendus de l'Academie Bulgare des Sciences, vol.57, p.7:5 (2004)

  54. O. Stanchev, Ts. Georgiev, Y. Goranova, R-band photometric profiles of 120 edge-on northern galaxies, Publications of the Astronomical Observatory of Belgrade (ISSN 0373-3742), No. 73, p. 231 - 246 (2002). In: Proceedings of the Third Bulgarian-Serbian Astronomical Meeting, May 13-15, 2002, Gjolechitsa, Bulgaria

  55. Y. Goranova, Ts. Georgiev, L. Iliev, I. Stateva, N. Tomov, Radial velocities of B-stars toward the galactic anti-center, Publications of the Astronomical Observatory of Belgrade (ISSN 0373-3742), No. 73, p. 153 - 157 (2002). In: Proceedings of the Third Bulgarian-Serbian Astronomical Meeting, May 13-15, 2002, Gjolechitsa, Bulgaria

  56. Ts. Georgiev, Extinction estimation from the colour-magnitude diagrams of resolved dwarf galaxies, Publications of the Astronomical Observatory of Belgrade (ISSN 0373-3742), No. 73, p. 143 - 148 (2002). In: Proceedings of the Third Bulgarian-Serbian Astronomical Meeting, May 13-15, 2002, Gjolechitsa, Bulgaria

  57. Ts. Georgiev, Fast image processing method for PC: 7. From median to mode filtering, Bulletin of the Special Astrophysical Observatory. Russian Academy of Sciences, Saint-Petersburg. (Izvestiya Spetsial'noi Astrofizicheskoi Observatorii), Vol. 53, p. 114 - 118 (2002)

  58. Ts. Georgiev, D. Bomans, Color-magnitude Diagrams of the Star-forming Galaxies Ho IX, Cam B, NGC 2976, and UGC 1281, Astronomische Gesellschaft Abstract Series, Vol. 18. Abstracts of Contributed Talks and Posters presented at the Annual Scientific Meeting of the Astronomische Gesellschaft at the Joint European and National Meeting JENAM 2001 of the European Astronomical Society and the Astronomische Gesellschaft at Munich, September 10-15, 2001, abstract #P142

  59. Ts. Georgiev, Observations with Rozhen Schmidt telescope and ST6 CCD camera, International Astronomical Union Commission 9, Working Group on Sky Surveys, The Newsletters, vol. 12, Issue 1, p.15 (2000)

  60. Ts. Georgiev, Cleaning and smoothing of frames using improved median methods, International Astronomical Union Commission 9, Working Group on Sky Surveys, The Newsletters, vol. 12, Issue 1, p.10 (2000)

  61. Ts. Georgiev, B. Bilkina, N. Dencheva, R. Ivanova, T. Valchev, The brightest stars and the distances to the galaxies NGC 1569 and NGC 2337, Bulg. J. Phys., Vol. 26, No. 1-2, p. 87-96 (1999)

  62. Ts. Georgiev, B. Bilkina, N. Dencheva, Calibration of the luminosity function of bright blue stars as a distance indicator for late-type galaxies, Astronomy Letters, Volume 23, Issue 5, September 1997, pp.656-665; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 753 (1997)

  63. Ts. Georgiev, B. Bilkina, N. Dencheva, Calibration of the brightest red and blue stars as distance indicators for late-type galaxies, Astronomy Letters, Volume 23, Issue 5, September 1997, pp.644-655; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 740 (1997)

  64. Ts. Georgiev, I. Karachentsev, N. Tikhonov, Distance moduli for thirteen nearby isolated dwarf galaxies, Astronomy Letters, Volume 23, Issue 4, July 1997, pp.514-521; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 586 (1997)

  65. I. Makarova, I. Karachentsev, Ts. Georgiev, Distances to six irregular galaxies in the Canes Venatici cluster from the brightest stars, Astronomy Letters, Volume 23, Issue 3, May 1997, pp.378-384; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 435 (1997)

  66. Ts. Georgiev, Fast image processing methods for PC. 5. Simultaneous cleaning of the impulse noise in two corresponding frames, Bulletin of the Special Astrophysical Observatory, Vol. 43, p. 164 - 170 (1997)

  67. Ts. Georgiev, PCVISTA-PLUS -- an extension of PCVISTA software, International Astronomical Union Commission 9, Working Group on Sky Surveys, The Newsletters, vol. 8, p.29 (1996)

  68. Ts. Georgiev, B. Bilkina, Can we estimate distances by means of luminosity functions of the stars in galaxies? International Astronomical Union Commission 9, Working Group on Sky Surveys, The Newsletters, vol. 8, p.27 (1996)

  69. Ts. Georgiev, Fast image processing methods for PC: 4. Iterative cleaning of the impulse noise, Bulletin of the Special Astrophysical Observatory, Vol. 41, p. 132 - 133 (1996)

  70. Ts. Georgiev, B. Bilkina, N. Dencheva, T. Valchev, Detection of red supergiant stars on the colour-colour diagrams in the system UBVRI, Bulletin of the Special Astrophysical Observatory, Vol. 41, p. 123-131 (1996)

  71. Ts. Georgiev, CCD stellar photometry in 13 dwarf irregular galaxies, Bulletin of the Special Astrophysical Observatory, Vol. 41, p. 88-122 (1996)

  72. Ts. Georgiev, Fast image processing methods for PC: 3. Partial restoration by intensified Richardson-Lucy method, Bulletin of the Special Astrophysical Observatory, Vol. 39, p. 140-145 (1996)

  73. Ts. Georgiev, Fast image processing methods for PC: 2. Regression smoothing without loss of resolution, Bulletin of the Special Astrophysical Observatory, Vol. 39, p. 131-139 (1996)

  74. Ts. Georgiev, Fast image processing method for PC: 1. Median smoothing and detaching of residual image, Bulletin of the Special Astrophysical Observatory, Vol. 39, p. 124-130 (1996)

  75. N. Pavlova, A. Shapovalova, F. Borngen, Ts. Georgiev, UBV photometry of the Seyfert galaxy Mkn 1040, Bulletin of the Special Astrophysical Observatory, Vol. 39, p. 47-58 (1996)

  76. Ts. Georgiev, On some effects of the development and the ageing of emulsions, Astrophysical Investigations, Vol. 7 (Supplement). Bulletin of the National Astronomical Observatory, p.257 (1996)

  77. Ts. Georgiev, A hypersensitization by pre-flashing of the direct photograph emulsions, Astrophysical Investigations, Vol. 7 (Supplement). Bulletin of the National Astronomical Observatory, p.252 (1996)

  78. Ts. Georgiev, Digital processing of extended astronomical images, Astrophysical Investigations, Vol. 7, p. 86 (1996)

  79. Ts. Georgiev, N. Tikhonov, I. Karachentsev, Brightest star cluster candidates in eight late-type galaxies of the local complex, Astronomical and Astrophysical Transactions, vol. 11, Issue 1, pp.47-58 (1996)

  80. Ts. Georgiev, N. Tikhonov, I. Karachentsev, V. Ivanov, Globular cluster candidates in the galaxies NGC 2366, IC 2574 and NGC 4236, Astronomical and Astrophysical Transactions, vol. 11, Issue 1, pp.39-46 (1996)

  81. Ts. Georgiev, Fast image processing methods for PC: Aperture stellar photometry without background estimation, International Astronomical Union Commission 9, Working Group on Sky Surveys, The Newsletters, vol. 7, p.9 (1995)

  82. Ts. Georgiev, Fast image processing methods for PC: 3. Partial restoration by intensified Richardson-Lucy method, International Astronomical Union Commission 9, Working Group on Sky Surveys, The Newsletters, vol. 7, p. 140-145 (1995)

  83. Ts. Georgiev, Fast image processing methods for PC: 2. Regression smoothing without loss of resolution, International Astronomical Union Commission 9, Working Group on Sky Surveys, The Newsletters, vol. 7, p. 131-139 (1995)

  84. Ts. Georgiev, Fast image processing method for PC: 1. Median smoothing and detaching of residual image, International Astronomical Union Commission 9, Working Group on Sky Surveys, The Newsletters, vol. 7, p. 124-130 (1995)

  85. N. Pavlova, A. Shapovalova, F. Borngen, Ts. Georgiev, UBV photometry of the Seyfert galaxy MKN 1040, Bulletin of the Special Astrophysical Observatory, Vol. 39, p. 47-58 (1995)

  86. Ts. Georgiev, R. Getov, E. Semkov, A. Mutafov, H. Todorova, A CCD camera (ST-6) at Rozhen Observatory: the BVRI system, IAU Working Group on Wide-Field Imaging, Newsl., No. 6, p. 21-22 (1994)

  87. Ts. Georgiev, Unbiased Multi-Parametric Estimations of Distances and Peculiar Velocities of the Galaxies, Astronomy from wide-field imaging: proceedings of the 161st Symposium of the International Astronomical Union, held in Potsdam, Germany, August 23-27, 1993. Edited by H. T. MacGillivray, E. B. Thomson, B. M. Lasker, I. N. Reid, D. F. Malin, R. M. West and H. Lorenz. International Astronomical Union. Symposium no. 161, Kluwer Academic Publishers, Dordrecht, p.715 (1994)

  88. Ts. Georgiev, Multi-Parametric Iris-Photometry, Astronomy from wide-field imaging: proceedings of the 161st Symposium of the International Astronomical Union, held in Potsdam, Germany, August 23-27, 1993. Edited by H. T. MacGillivray, E. B. Thomson, B. M. Lasker, I. N. Reid, D. F. Malin, R. M. West and H. Lorenz. International Astronomical Union. Symposium no. 161, Kluwer Academic Publishers, Dordrecht, p.311 (1994)

  89. Ts. Georgiev, R. Getov, E. Semkov, A. Mutafov, H. Todorova, A CCD Camera (ST-6) at Rozhen Observatory: the BVRI System, International Astronomical Union Commission 9, Working Group on Sky Surveys, The Newsletters, vol. 6, p.21 (1994)

  90. I. Karachentsev, Ts. Georgiev, S. Kajsin, A. Kopylov, CCD Photometry of Thin Edge-on Galaxies, Poster Papers on Stellar Photometry, Poster Proceedings of the IAU Colloquium No. 136 held in Dublin, Ireland, 4-7 August, 1992. Edited by I. Elliott, and C. J. Butler, p.189 (1993)

  91. Ts. Georgiev, N. Tikhonov, B. Bilkina, R. Getov, P. Nedialkov, The precise coordinates of the supergiant and globular cluster candidates of the galaxy M81, Bulletin of the Special Astrophysical Observatory, Vol. 36, p. 43-51 (1993)

  92. Ts. Georgiev, B. Bilkina, N. Tikhonov, The distribution of blue and red stars around the M 81 galaxy, Astronomy and Astrophysics, Suppl. Ser., Vol. 96, p. 569-581 (1992)

  93. Ts. Georgiev, B. Bilkina, N. Tikhonov, The brightest blue and red stars in the galaxy M 81, Astronomy and Astrophysics, Suppl. Ser., Vol. 95, p. 581-588 (1992)

  94. I. Karachentsev, Ts. Georgiev, S. Kajsin, A. Kopylov, V. Ryadchenko, V. Shergin, Flat edge-on galaxies. Atlas and photometry, Astronomical and Astrophysical Transactions, vol. 2 (4) 265-325 (1992)

  95. I. Karachentsev, N. Tikhonov, Ts Georgiev, B. Bilkina, M. Sharina, Distances of the nearby galaxies NGC 1560, NGC 2976 and DDO 165 from their brightest stars, Astronomy and Astrophysics, Suppl. Ser., (Vol. 91) 503-512 (1991)

  96. M. Geffert, H. Tucholke, Ts. Georgiev, J. Le Campion, Membership of ultraviolet-bright stars in the globular cluster M12, Astronomy and Astrophysics, Suppl. Ser. (Vol. 91) 487-495 (1991)

  97. Ts. Georgiev, N. Tikhonov, I. Karachentsev, Estimated B and V Magnitudes of Globular Cluster Candidates in M81, Soviet Astronomy Letters, Vol. 17 (6) p. 416 (1991)

  98. Ts. Georgiev, N. Tikhonov, I. Karachentsev, B. Bilkina, The brightest stars and the distance to the dwarf galaxy HO IX, Astronomy and Astrophysics, Suppl. Ser. (Vol. 89) p. 529 (1991)

  99. N. Tikhonov, B. Bilkina, I. Karachentsev, Ts. Georgiev, Distance of nearby galaxies NGC 2366, IC 2574, and NGC 4236 from photometry of their brightest stars, Astronomy and Astrophysics, Suppl. Ser. (Vol. 89) p. 1 (1991)

  100. Ts. Georgiev, R. Getov, Morphology of the Bulge in M81, Soviet Astronomy Letters, Vol. 17 (3) p. 168 (1991)

  101. Ts. Georgiev, N. Tikhonov, I. Karachentsev, The Brightest Candidates for Globular Clusters in M81, Soviet Astronomy Letters, Vol.17 (3) p. 165 (1991)

  102. Ts. Georgiev, R. Getov, Morphology of the M 81 galaxy bulge, Pis'ma Astron. Zu. (Vol. 17) 393-403 (1991)

  103. Ts. Georgiev, N. Tikhonov, I. Karachentsev, The brightnest globular candidates of M 81 galaxy, Pis'ma Astron. Zu. (Vol. 17) 387-392 (1991)

  104. B. Bilkina, R. Getov, Ts. Georgiev, A survey of blue and red stars in the field of 30'x30' around the M 81 galaxy, Soobshch. Spets. Astrof. Obs. (Vol. 67) 119-128 (1991)

  105. Ts. Georgiev, Photometric processing of CCD images of galaxies, Bulletin of the Special Astrophysical Observatory - North Caucasus (Vol. 33) 175-182 (1991)

  106. Ts. Georgiev, G. Ivanov, Distribution of blue stars and gas in galaxy M33, Bulletin of the Special Astrophysical Observatory - North Caucasus (Vol. 31) 26-32 (1991)

  107. D. Kiurkchieva, V. Shkodrov, Ts. Georgiev, Light curves of binary systems where one of the components is a spotted star, Astrophysical Investigations (vol. 6) 40-46 (1991)

  108. Ts. Georgiev, Photometrical processing of CCD images of galaxies, Astrofisik. Issledovanija - Sofia (Vol. 33) 213-221 (1991)

  109. Ts. Georgiev, G. Ivanov, On the distribution of blue stars and gas in M 33, Astrofisik. Issledovanija - Sofia (Vol. 31) p. 29 (1991)

  110. T. Georgiev, R. Getov, V. Zamanova, G. Ivanov, UBV Surface Photometry of Associations - the Distance Modulus of M51, Soviet Astronomy Letters, Vol.16 (6) p. 420 (1990)

  111. Ts. Georgiev, R. Getov, V. Zamanova, G. Ivanov, UBV surface photometry of the associations and estimation of the M 51 distance modulus, Pis'ma Astron. Zu. (Vol. 16) p. 979 (1990)

  112. Ts. Georgiev, On the Increase of the Efficiency of U Photoplates by Means of Pre Exposure in B-Light, Astronomicheskii Tsirkulyar (No.1543) p. 37 (1990)

  113. V. Zsintsarov, D. Marchev, Ts. Georgiev, On hypersensitization of ZU21 astroemulsion, Soobshch. Spets. Astrofiz. Obs. (Vyp. 65) 95-99 (1990)

  114. V. Tsintsarov, M. Panov, Ts. Georgiev, Hypersensitization of emulsion IV-N by means of a solution of silver nitrate and benzotriazole, Bulletin of the Special Astrophysical Observatory - North Caucasus, Vol. 32, p. 161-162 (1990)

  115. Y. Stajkov, I. Pamukchiev, Ts Georgiev, B. Bilkina, Improved microphotometer of the Rozhen Observatory, Bulletin of the Special Astrophysical Observatory - North Caucasus, Vol. 32, p. 157-160 (1990)

  116. R. Getov, Ts. Georgiev, Distribution of the brightnesses and colors of the bulge of galaxy M81, Bulletin of the Special Astrophysical Observatory - North Caucasus, Vol. 32, p. 1-11 (1990)

  117. Ts. Georgiev, The residual image method and some of its applications, Bulletin of the Special Astrophysical Observatory - North Caucasus, Vol. 30, p. 122-132 (1990)

  118. Ts. Georgiev, The Rozhen Image Processing Package and some of its applications, Bulletin of the Special Astrophysical Observatory - North Caucasus, Vol. 30, p. 106-121 (1990)

  119. V. Tsintsarov, M. Panov, Ts. Georgiev, Hypersensitization of a IV-N emulsion by a silver nitrat solution and benzotriazole, Astrofiz. Issled. Izv. Spets. Astrofiz. Obs., Tom 32, p. 201-203 (1990)

  120. Sajkov, Yu.; Pamukchiev, I.; Georgiev, Ts.; Bilkina, B. An improved microphotometer of the Rozhen Observatory, Astrofiz. Issled. Izv. Spets. Astrofiz. Obs., Tom 32, p. 197-200 (1990)

  121. R. Getov, Ts. Georgiev, On the brightness and colour distribution of the M81 galaxy bulge, Astrofisik. Issledovanija - Sofia, Vol. 32, p. 3 (1990)

  122. Ts. Georgiev, The residual image method and some of its applications, Astrofisik. Issledovanija - Sofia, Vol. 30, p. 127 (1990)

  123. Ts. Georgiev, The Rozhen image processing pachage and some of its applications, Astrofisik. Issledovanija - Sofia, Vol. 30, p. 111 (1990)

  124. G. Ivanov, Ts. Georgiev, P. Kunchev, The Outermost OB Associations in M33, Astrophysics and Space Science, Volume 159 (1) 103-107 (1989)

  125. Ts. Georgiev, Large-scale surface photometry of M 31 Galaxy, Astrophysical Investigations, Vol. 5, p.23 (1989)

  126. Ts. Georgiev, Large-scale surface photometry of M31 galaxy, Astrofisik. Issledovanija - Sofia, Vol. 5, p. 23-32 (1989)

  127. Ts. Georgiev, B. Bilkina, G. Ivanov, On the gradients of surface brightness of the Andromeda galaxy, Astrofisik. Issledovanija - Sofia (Vol. 5) 13-22 (1989)

  128. Ts. Georgiev, Morphological functions of the M 31 galaxy image, Pis'ma Astron. Zu., Vol. 14, p. 882-887 (1988)

  129. Ts. Georgiev, Morphological Functions for the Image of M31, Soviet Astronomy Letters, Vol.14 (5) p. 374 (1988)

  130. R. Getov, Ts. Georgiev, Low-Brightness Formations in the Field of M81 and M82, Soviet Astronomy Letters, Vol.14 (5) p. 345 (1988)

  131. Ts. Georgiev, Photometric Diagrams of the M31 Image, Soviet Astronomy Letters, Vol.14 (5) p. 342 (1988)

  132. R. Getov, Ts. Georgiev, Observations of low brightness formations in the region of the M 81 galaxy, Pis'ma Astron. Zu., Vol. 14, p. 811-816 (1988)

  133. Ts. Georgiev, Photometrical diagrams of the M 31 galaxy image, Pis'ma Astron. Zu., Vol. 14, p. 806-810 (1988)

  134. Ts. Georgiev, B. Bilkina, Star complexes in the inner part of the M 31, Astronomicheskii Tsirkulyar, Vol. 1530, p. 11-12 (1988)

  135. Ts. Georgiev, U-Band Spiral Structure in M31, Soviet Astronomy Letters, Vol.14 (1) p. 53, (1988)

  136. Ts. Georgiev, On the spiral structure of M 31 galaxy in U-light, Pis'ma Astron. Zu., Vol. 14, p. 129-139 (1988)

  137. Ts. Georgiev, Two Digital Filtering Methods and the Spiral Structure of the M 31 Galaxy (With 5 Figures), Astrophotography, Proceedings of the IAU Workshop, Jena, GDR, 21-24 April 1987. Edited by S. Marx. Berlin Heidelberg New York: Springer-Verlag (1988) p.162

  138. O. Zichovб, J. Zicha, V. Tsintsarov, L. Iliev, Ts. Georgiev, Temperature Influence on Hydrogen Treatment of Kodak IIa-O and 103a-O Plates (With 5 Figures), Astrophotography, Proceedings of the IAU Workshop, Jena, GDR, 21-24 April 1987. Edited by S. Marx. Berlin Heidelberg New York: Springer-Verlag (1988) p.49

  139. V. Tsintsarov, Ts. Georgiev, M. Tsvetkov, B. Kovatchev, M. Panov, Hypersensitization of Kodak IN Emulsions at the Rozhen National Astronomical Observatory (With 3 Figures), Astrophotography, Proceedings of the IAU Workshop, Jena, GDR, 21-24 April 1987. Edited by S. Marx. Berlin Heidelberg New York: Springer-Verlag (1988) p.42

  140. M. Tsvetkov, Ts. Georgiev, B. Bilkina, A. Tsvetkova, E. Semkov, The photometric UBVR system of the 50/70 cm Schmidt telescope of the National Astronomical Observatory Rozhen, Bolgarskaia Akademiia Nauk, Doklady (ISSN 0366-8681), vol. 40 (5) 9-12 (1987)

  141. D. Kiurkchieva, V. Shkodrov, T. Bonev, Ts. Georgiev, The light curve of a double system of spherical stars one of them having two surface spots, Bolgarskaia Akademiia Nauk, Doklady, vol. 39 (4) p. 5-8 (1986)

  142. Ts. Georgiev, G. Ivanov, Distribution of surface brightness across the spiral arm S4 in the Andromeda galaxy, Pisma v Astronomicheskii Zhurnal (vol. 11) 178-183 (1985) Soviet Astronomy Letters, vol. 11 (3-4) (1985) p. 73-75. Translation

  143. Ts. Georgiev, G. Ivanov, Surface Brightness Distribution across M31 Arm S4, Soviet Astronomy Letters (vol. 11) 73-75 (1985) Translation Pisma v Astronomicheskii Zhurnal, vol. 11 (3) 178-183 (1985)

  144. Ts. Georgiev, B. Bilkina, G. Ivanov, On surface photometry of M31 with a 50/70-cm Schmidt telescope, Astronomical instruments and methods of observations, p. 41-45 (1985)

  145. Ts. Georgiev, B. Bilkina, On the use of ORWO ZU-21 astronomical emulsion under conditions of underexposure, Astronomical instruments and methods of observations, p. 36-40 (1985)

  146. Ts. Georgiev, G. Ivanov, B. Bilkina, Distribution of surface strength transversal to spiral arms in Andromeda Galaxy, Bolgarskaia Akademiia Nauk, Doklady, vol. 38 (8) 957-959 (1985)

References

  1. Ц. Георгиев, Доправени притчи (Присмехулни словеса), Мултипринт, София (2019)

  2. Годишник 2015, Департамент по природни науки при Нов Български университет (2015)

  3. Publications

  4. Д. Колев, Българската астрономия от Йоан Екзарх до наши дни, Bulgarian Astronomical Journal (15) 129-166 (2011)

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