| Issue |
A&A
Volume 365, Number 1, January 2001
First Results from XMM-Newton
|
|
|---|---|---|
| Page(s) | L273 - L276 | |
| DOI | https://doi.org/10.1051/0004-6361:20000065 | |
| Published online | 15 January 2001 | |
XMM-Newton optical monitor observations of LMC X-3
1
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, rs1@mssl.ucl.ac.uk
Received:
2
October
2000
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
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