Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203l..27p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 2, Sept. 1988, p. L27-L30.
Astronomy and Astrophysics
Astrophysics
52
Accretion Disks, Eclipsing Binary Stars, Magellanic Clouds, Stellar Spectrophotometry, X Ray Binaries, Abundance, Cataclysmic Variables, Light Curve, Stellar Luminosity, X Ray Spectra
Scientific paper
The faint and soft Einstein point source LHG 87 is identified as a low-mass X-ray binary in the LMC. The 19 mag optical counterpart displays a spectrum characteristic of X-ray-heated accretion disks. The Bowen excited N III complex is much less intense than the He II 4686-A emission, indicating low metal abundance. The optical light curve provides evidence for a deep eclipse of the accretion disk by the secondary star. Therefore the X-ray source may be hidden from direct view and be intrinsically as bright as the luminous low-mass X-ray binary LMC X-2 which has a disk of comparable optical brightness. Scattering of X-rays, however, does not readily explain the extreme softness of the X-ray spectrum which has a blackbody temperature kT of about 0.1 keV. In this respect, the system is similar to LHG 83 and both differ significantly from the known Galactic low-mass X-ray binaries.
Beuermann Klaus
Pakull Manfred W.
Paradijs Jan van
van der Klis Michael
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