2002/09/27 by V. P. Goranskij, E. A. Barsukova, Goranskij, V. P. +6
Decision Sciences · Engineering · Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #FOS: Physical sciences #Mechanics and Biomechanics Studies #Multidisciplinary Science and Engineering Research #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0209592
3 pages, 2 figures, Proceedings of the 4th Microquasar Workshop, 2002, Eds. Ph.Durouchoux, V.Fuchs, & J.Rodrigues, publ. by the Center for Space Physics, Kolkata
arxiv created 2002/09/27 · openalex publication_date 2002/09/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The results of photometric CCD monitoring and spectral observations of the black hole binary and microquasar V4641 Sgr in the quiet state are presented. The ellipsoidal light curve with large amplitude of 0.36m in R band suggests the influence of a massive object orbiting around a normal B9 star. In the spectra taken with the 6-m telescope one hour before black hole inferior conjunction, an absorption component in the red wing of Halpha line is visible. It is formed by gaseous stream moving in the direction to the normal star. That suggests the grazing conjunction in this system. Maximum velocity of the stream is of 650 km/s. Assuming that the stream is moving through the circular Keplerian orbit around black hole, the mass of the black hole is determined to be MBH=7.1-9.5Msun, what confirms the model by Orosz et al.