Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26at...24..383k&link_type=abstract
Astronomical and Astrophysical Transactions, vol. 24, Issue 5, p.383-389
Astronomy and Astrophysics
Astronomy
7
X-Ray Binary, Cyg X-1, Optical Spectroscopy, Doppler Tomography
Scientific paper
We report the results of Cyg X-1 spectral monitoring for 2002 2004. A comparison of observed and non-local thermal equilibrium model profiles for H I, He I and Mg II is given, taking into account the tidal distortion of the Cyg X-1 optical component and its illumination by X-ray emission from the secondary component. We set limits on the main characteristics of the optical component, Teff=30400±500K and log g=3.31±0.07, and on the overabundances of He and Mg, [He]/[H]=0.43±0.06 dex and [Mg]/[H]=0.75±0.15 dex. The Doppler images were reconstructed by an improved Doppler tomography method on the basis of nine He II (?=4686Å) profiles from 2003 (the ‘soft’ X-ray state) and six profiles from 2004 (the ‘hard’ X-ray state). This allowed us to set limits on the black-hole-to-supergiant mass ratio (1/4)=slant MX/MO=slant (1/3).
Agafonov Michail I.
Bochkarev Nikolai G.
Bondar' A. V.
Galazutdinov G. A.
Karitskaya Eugenia A.
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