Journal Article

Optical and infrared light curves of the eclipsing X-ray binary V395 Car = 2S 0921−630

T. A. Ashcraft, R. I. Hynes and E. L. Robinson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 1, pages 620-624
Published in print July 2012 | ISSN: 0035-8711
Published online July 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21241.x
Optical and infrared light curves of the eclipsing X-ray binary V395 Car = 2S 0921−630

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We present results of optical and infrared photometric monitoring of the eclipsing low-mass X-ray binary V395 Car (2S 0921−630). Our observations reveal a clear, repeating orbital modulation with an amplitude of about 1 mag in B and V, and a little less in J. Combining our data with archival observations spanning about 20 years, we derive an updated ephemeris with orbital period 9.0026 ± 0.0001 d. We attribute the modulation to a combination of the changing aspect of the irradiated face of the companion star and eclipses of the accretion disc around the neutron star. Both appear to be necessary as a secondary eclipse of the companion star is clearly seen. We model the B, V and J light curves using a simple model of an accretion disc and companion star and find a good fit is possible for binary inclinations of 82.°2 ± 1.°0. We estimate the irradiating luminosity to be about 8 × 1035 erg s−1, in good agreement with X-ray constraints.

Keywords: accretion, accretion discs; binaries: close; binaries: eclipsing; stars: individual: V395 Car; stars: individual: 2S 0921−630

Journal Article.  3582 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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