Optical and Infrared Light Curves of the Eclipsing X-ray Binary V395 Car = 2S 0921-630
arXiv:1206.0032 · doi:10.1111/j.1365-2966.2012.21241.x
Abstract
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 one magnitude 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+/-0.0001d. We attribute the modulation to a combination of the changing aspect of the irradiated face of the companion star and eclipses of the accretion disk 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 lightcurves using a simple model of an accretion disk and companion star and find a good fit is possible for binary inclinations of 82.2+/-1.0 degrees. We estimate the irradiating luminosity to be about 8x10^35 erg/s, in good agreement with X-ray constraints.
6 pages, accepted for publication in MNRAS
References in corpus (2)
Cited by in corpus (8)
- Black Holes in Short Period X-ray Binaries and the Transition to Radiatively Inefficient Accretion
- Evidence for mass-dependent peculiar velocities in compact object binaries: Towards better constraints on natal kicks
- An Observationally-Derived Kick Distribution for Neutron Stars in Binary Systems
- A different view of wind in X-ray binaries: The Accretion Disc Corona source 2S 0921-630
- X-ray spectroscopy of the accretion disk corona source 2S 0921-630 with Suzaku archival data
- Broad-band spectral analysis of LMXB 2S 0921-63 with Suzaku
- The detection of high X-ray polarization from an accretion disc corona source and its modelling via Monte Carlo radiation transfer simulation
- X-ray polarization of Z-type neutron star low-mass X-ray binaries -- II. Spectropolarimetric analysis