Infrared observations of Nova Muscae 1991: Black hole mass determination from ellipsoidal variations

被引:52
作者
Gelino, DM [1 ]
Harrison, TE [1 ]
McNamara, BJ [1 ]
机构
[1] New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA
关键词
binaries : close; stars : individual (Nova Muscae 1991); stars : low-mass; stars : variables : other;
D O I
10.1086/321159
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have obtained infrared photometry for the soft X-ray transient GU Mus. We present J- and K-s(-) band light curves modeled with WD98, the newest version of the Wilson-Devinney light curve-modeling code. Using detailed models for the expected ellipsoidal variations due to the nonspherical secondary star, we show that the most likely value for the orbital inclination is 54 degrees +/- 1.degrees5. This inclination angle is consistent with those previously published, but it has a much smaller error. This inclination implies a primary black hole mass of 6.95 +/- 0.6 M. While we do not see any evidence for contamination of our infrared light curves from other sources in the system, a conservative model with a contamination level of 15% increases the uncertainty in the inclination angle to deg. 54(-1.5)(+4) deg.
引用
收藏
页码:971 / 978
页数:8
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