Optical studies of V404 Cyg, the X-ray transient GS2023 + 338. II - High-resolution H-alpha spectroscopy in quiescence

Bibcode
1992MNRAS.255....7C
Casares, J.; Charles, P. A.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 1, 1992, p. 7-18.

Advertised on:
3
1992
Number of authors
2
IAC number of authors
1
Citations
24
Refereed citations
20
Description
Results of high-resolution optical spectroscopy of V404 Cyg (the optical counterpart of the X-ray transient GS2023 + 338), conducted 13 months after the May 1989 outburst are presented. The double-peaked H-alpha line exhibits a strong S-wave modulation from which a periodicity of 5.7 hr is deduced. The level of the continuum is also modulated on the same time-scale. This behavior is identified with the orbital period of the system. There are also changes in the FWHM and peak separation, which evolves from widening to subsequent shrinking. Such variations suggest a very complex line profile consisting perphaps of several different components.
Type
Refereed
Novae
Visual observation

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