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Optical and Infrared Photometry of the Micro-Quasar GRO J1655-40 in Quiescence
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We present BVIJK photometry of the black-hole candidate GRO J1655-40 in full quiescence. We report a refined orbital period of 2.62191 +/- 0.00020 days. The light curves are dominated by ellipsoidal variations from the secondary star. We model the light curves with an upgraded code which includes a more accurate treatment of limb darkening. Previous models containing a large cool disk are ruled out, and indeed our data can be fit with a pure ellipsoidal light curve without any disk contribution. In general agreement with previous results, we derive a confidence region of the correlated quantities of inclination and mass ratio, centered on an inclination of 70.2 +/ 1.9 degrees, and mass ratio 2.6 +/- 0.3, resulting in a primary mass M = 6.3 +/- 0.5 Mo (all 95% confidence). The complex limits and errors on these values, and on the possible disk contribution to the light curve, are discussed.
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