Infrared Observations of Nova Muscae 1991: Black Hole Mass Determination from Ellipsoidal Variations
نویسندگان
چکیده
We have obtained infrared photometry for the soft x-ray transient GU Mus. We present J and Ks 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 non-spherical secondary star, we show that the most likely value for the orbital inclination is 54±1.5. This inclination angle is consistent with those previously published, but 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 54 −1.5. Subject headings: binaries: close − stars: black holes − stars: individual (Nova Muscae 1991) − stars: low mass − stars: variables: other
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