The population of massive X-ray binaries - I. The Large Magellanic Cloud

被引:50
|
作者
Negueruela, I
Coe, MJ
机构
[1] Observatoire de Strasbourg, 67000 Strasbourg
关键词
stars : binaries : close; X-rays : binaries; stars : early-type; stars : emission line; Be; galaxies : Magellanic Clouds;
D O I
10.1051/0004-6361:20020139
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present high resolution blue spectroscopy of an almost complete sample of optical counterparts to massive X-ray binaries in the Large Magellanic Cloud (LMC) and derive their spectral classification. We find an spectral type B0II for the optical counterpart to RX J0532.5-6551, confirming it as the first wind-fed massive X-ray binary in the LMC. We also confirm the Be nature of the proposed counterpart to RX J0535.0-6700. The proposed optical counterpart to RX J0531.5-6518 is a B2V star with signs of emission in the Balmer lines. In total, we give accurate spectral types for 14 counterparts. We find that the overall observed population of massive X-ray binaries in the LMC has a distribution not very different from the observed Galactic population and we discuss different selection effects affecting our knowledge of this population. The spectral distribution of the Be/X-ray binary population is also rather similar to the Galactic one. This distribution implies that Be/X-ray binaries must have preferentially formed from moderately massive binaries undergoing semi-conservative evolution. The observation of several Be/X-ray binaries with large eccentricities implies then the existence of supernova kicks.
引用
收藏
页码:517 / 532
页数:16
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