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Low-Mass X-Ray Binaries in the LMC

Published online by Cambridge University Press:  12 April 2016

M.W. Pakull ,
K. Beuermann ,
L.P. Angebault  and
L. Bianchi
M.W. Pakull
Affiliation:
Institut für Astronomie und Astrophysik, Technische Universität Berlin, Berlin, F.R.G.
K. Beuermann
Affiliation:
Institut für Astronomie und Astrophysik, Technische Universität Berlin, Berlin, F.R.G.
L.P. Angebault
Affiliation:
European Southern Observatory, Garching, F.R.G.
L. Bianchi
Affiliation:
Osservatorio Astronomico di Torino, Pino Torinese, Italy

Abstract

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We report results on three low-mass X-ray binaries (LMXB) in the LMC, obtained with EXOSAT, IUE and ground-based (ESO) telescopes: LMC X-2 which appears to be “Sco X-l”-like, LHG 83 and LHG 87. The latter are two weaker sources first detected in the course of the HEAO-B LMC survey. They have faint optical counterparts of which LHG 87 was only recently identified by us. In X-rays, they are characterized by ultrasoft X-ray spectra possibly characteristic of black-hole primaries. LHG 83 furthermore shows evidence for X-ray ionization of the surrounding interstellar medium, similar to the He III region around the black-hole candidate LMC X-l. X-ray binaries with masses of compact objects in excess of 3 M⊙ and ultrasoft X-ray spectra are comparatively frequent in the LMC. We suggest that subcritical accretion onto black holes takes place in LHG 83 and LHG 87.

Type
VII. Related Objects
Information
International Astronomical Union Colloquium , Volume 93: Cataclysmic Variables: Recent Multi-Frequency Observations and Theoretical Developments , 1987 , pp. 689
Copyright
Copyright © Reidel 1987