XMM-Newton optical monitor observations of LMC X-3
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, RH5 6NT, UK
2 School of Physics, University of Sydney, Sydney 2006, NSW, Australia
Corresponding author: R. Soria, firstname.lastname@example.org
Accepted: 26 October 2000
We study the optical counterpart of the black-hole X-ray binary LMC X-3, by using XMM-Newton/OM observations carried out during a low-hard X-ray state. We derive a better constraint for the temperature, mass and radius of the companion star, and we show that the star is likely to be a ~B5 subgiant filling its Roche lobe. Taking into account the effect of X-ray irradiation, we suggest a value for the mass function in this system, lower than previously thought; we provide a more accurate lower limit to the mass of the compact object.
Key words: accretion, accretion disks / black hole physics / binaries: general / stars: early type / X-rays: general
© ESO, 2001