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CYG X-1 = V1357 CYG investigation based on high-resolution optical spectroscopy of 2002–2004

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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, T eff =30 400±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 (?=4686 Å) 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 M X / M O = slant (1/3).
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Keywords: Cyg X-1; Doppler tomography; Optical spectroscopy; X-ray binary

Document Type: Research Article

Affiliations: 1: Astronomical Institute of the Russian Academy of Science, 48 Pyatnitskaya Street, Moscow, 119017, Russia 2: Radiophysical Research Institute (NIRFI), 25, Bol'shaya Pecherskaya Street, Nizhny Novgorod, 603600, Russia 3: Sternberg Astronomical Institute, 13 Universitetskij Prospekt, Moscow, 119992, Russia 4: IC AMER, Terskol, 361605, Russia 5: Korean Astronomy Observatory, Optical Astronomy Division, 61-1 Hwaam-dong, Yuseong-gu, Daejeon, 305-348, South Korea 6: Bohyunsan Optical Astronomy Observatory, Jacheon POB, Youngchun, Kyungpook, 770-820, South Korea 7: Astronomy Department, Kazan University, 18 Kremliovskaya Street, Kazan, 420008, Russia 8: Tartu Observatory, 61602 Toravere, Tartumaa, Estonia

Publication date: 2005-10-01

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