Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...76..185v&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 76, no. 2, Dec. 1988, p. 185-188.
Astronomy and Astrophysics
Astrophysics
16
Astronomical Photometry, Eclipsing Binary Stars, X Ray Binaries, Accretion Disks, Brightness Distribution, Charge Coupled Devices, Light Curve, Stellar Mass
Scientific paper
Optical photometry of the transient X-ray source 0748-676 in January 1988 showed the system to be bright (V of about 17.5), which suggests that after it was discovered in 1985 it has remained active for most of the time. The orbital optical light curve is similar to that of other eclipsing low-mass X-ray binaries, e.g., 4U 2129+47 and Her X-1. This light curve consists of an approximately sinusoidal component (amplitude of about 0.3 mag) with a rather sharp cusp (depth of about 0.3 mag) centered on the time of the X-ray eclipse. The first component, which is similar to the optical light curves observed for noneclipsing low-mass X-ray binaries, is likely due to aspect variations of the X-ray heated parts of the surface of the secondary star. The second component is probably caused by partial eclipse of an accretion disk.
Paradijs Jan van
Pedersen Holger
van der Klis Michael
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