A Multiwavelength, Multiepoch Study of the Soft X-Ray Transient Prototype, V616 Monocerotis (A0620-00)
Abstract
We have obtained optical and infrared photometry of the soft X-ray transient prototype V616 Mon (A0620-00). From this photometry, we find a spectral type of K4 for the secondary star in the system, which is consistent with spectroscopic observations. We present J-, H-, and K-band light curves modeled with WD98, the newest version of the Wilson-Devinney light-curve modeling code, and the ELC code. By combining detailed, independently run models for ellipsoidal variations due to a spotted, nonspherical secondary star and the observed ultraviolet to infrared spectral energy distribution of the system, we show that the most likely value for the orbital inclination is 40.75d+/-3°. This inclination angle implies a primary black hole mass of 11.0+/-1.9 M solar. This work was partly based on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium.
- Publication:
-
The Astronomical Journal
- Pub Date:
- November 2001
- DOI:
- 10.1086/323714
- arXiv:
- arXiv:astro-ph/0108094
- Bibcode:
- 2001AJ....122.2668G
- Keywords:
-
- Stars: Binaries: Close;
- stars: black holes;
- stars: individual (V616 Monocerotis);
- Stars: Low-Mass;
- Brown Dwarfs;
- Stars: Variables: General;
- Astrophysics
- E-Print:
- 29 pages (preprint format), including 7 figures and 4 tables, accepted for publication in the Nov 2001 issue of AJ