Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003kfnts...4..230k&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, Suppl, no. 4, p. 230-233
Physics
2
Scientific paper
Recently numerous photometric effects were found during the investigation of the first black hole candidate Cyg X-1. For example, in addition to orbital variations, there are different kinds of flares, the so-called precession period of 147/294 days, and a significant correlation between the long-time optical variations and the 2-10 keV X-ray variations with the time lag of one or two weeks. Detailed spectral analysis (including the Doppler tomography) is necessary for understanding the physical nature of these phenomena. In this report we discuss the high-resolution spectroscopy potentialities for recognizing the manner of gas flow between the components, the origin of a 147-day period as well as for determining the physical characteristics of gas both in the region of accretion structure (especially during the flares caused by an increasing accretion matter flux) and outflowing from supergiant, and so on. The echelle-spectrometer of the Terskol 2-m telescope could be very useful for these purposes.
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