Abstract
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 that includes a more accurate treatment of limb darkening. Previous models containing a large cool disk are ruled out, and, indeed, our data can be fitted 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 inclination and mass ratio, centered on an inclination of 70°.2 ± 1°.9 and mass ratio of 2.6 ± 0.3, resulting in a primary mass M1 = 6.3 ± 0.5 M⊙ (all 95% confidence). The complex limits and errors on these values and on the possible disk contribution to the light curve are discussed.
Original language | English (US) |
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Pages (from-to) | 1290-1297 |
Number of pages | 8 |
Journal | Astrophysical Journal |
Volume | 554 |
Issue number | 2 PART 1 |
DOIs | |
State | Published - Jun 20 2001 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
Keywords
- Accretion, accretion disks
- Binaries: close
- Black hole physics
- Stars: individual (GRO J1655-40)
- X-rays: stars