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The quiescence optical light curve of Nova Scorpii 1994 (=GRO J1655-40)

Frank van der Hooft·Martin Heemskerk·Frank Alberts·Jan van Paradijs
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Abstract

We report on extensive V, R, and i band photometry of the black-hole candidate Nova Sco 1994 (GRO J1655-40) obtained during March 1996, when the source was close to its quiescent pre-outburst optical brightness (V=17.3). From our observations and data taken from the literature we derive a refined ephemeris for inferior conjunction of the secondary star: HJD 2449838.4198(52) + 2.62168(14) x N. We have modeled the V, R, and i band light curves in terms of a Roche lobe filling secondary and an accretion disk around the compact star, the latter described as a flat cylinder with a radial temperature distribution. From the shape of the light curve we constrain the binary inclination and mass of the secondary star to lie in the ranges 63.7-70.7 degrees and 1.60-3.10 Solar masses, respectively. This limits the mass of the black-hole to the range 6.29-7.60 Solar Masses. The mass range we obtained for the secondary star is supported by the results of stellar evolution calculations.

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Frank van der Hooft, Martin Heemskerk, Frank Alberts, Jan van Paradijs. 1997-09-16. The quiescence optical light curve of Nova Scorpii 1994 (=GRO J1655-40). https://arxiv.org/abs/astro-ph/9709151

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