Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-09-16
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy and Astrophysics Uses L-AA version 3 8 pages plus 10 ps figures
Scientific paper
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.
Alberts Frank
der Hooft Frank van
Heemskerk Martin
Paradijs Jan van
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