The soft X-ray transient GS2000 + 25. I - an 8.3-hr modulation during outburst

Details The soft X-ray transient GS2000 + 25. I - an 8.3-hr modulation during outburst The soft X-ray transient GS2000 + 25. I - an 8.3-hr modulation during outburst

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..567c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 567-572.

Astronomy and Astrophysics

Astronomy

57

Astronomical Photometry, Optical Emission Spectroscopy, X Ray Astronomy, X Ray Binaries, Black Holes (Astronomy), Ccd Star Tracker, Light Curve, Stellar Orbits, X Ray Spectra

Scientific paper

Optical spectroscopy of the X-ray transient, GS2000 + 25 during its 1988 outburst shows that this system is similar to A0620 - 00 but at a greater distance (greater than 2 kpc). Photometry from La Palma and Russia is presented that reveals a 0.1-mag modulation at a period of 8.33 hr, associated with the orbital period. It is proposed that the modulation, which is in the form of a 'hump' in the light curve, is analogous to the mechanism of an eccentric, precessing accretion disk used by Whitehurst (1988) to account for superhumps in SU UMa systems. If confirmed, this would strengthen the relationship between the outburst behavior of low mass X-ray binaries and cataclysmic variables.

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