A Refined Black Hole Mass for the X-ray Transient GRS 1009-45

Details A Refined Black Hole Mass for the X-ray Transient GRS 1009-45 A Refined Black Hole Mass for the X-ray Transient GRS 1009-45

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714304m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #143.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have acquired new spectroscopic and photometric observations of the black hole binary GRS 1009-45. The source was observed using the MagE spectrograph on the 6.5m Magellan Clay Telescope at Las Campanas Observatory in February, 2008. A total of 11 useful spectra with a resolving power of 4000 were obtained. The source was monitored by the 1.3m SMARTS telescope at Cerro Tololo Observatory between December, 2007 and June, 2010. In total we obtained 342 useful images in R and 119 images in J. Additional J- and Ks-band images were obtained using the PANIC camera on the Magellan Baade Telescope April, 2008. From the spectra we were able to measure (for the first time) the rotational velocity of the K-star companion. The projected rotational velocity of 86.8 +\- 5.2 km/sec implies a mass ratio of M/M2 of about 17. The spectra also imply an R-band disk fraction of about 30%. The SMARTS light curves show evidence for a strong asymmetry that changes slowly with time. Previously published light curves obtained in runs of a few nights also show an asymmetry. This feature was modeled using a bright spot on the accretion disk. Using all of the available light curves we find an inclination near 50 degrees, and component masses of about 8.5 and 0.5 solar masses for the black hole and companion star, respectively.
P. M. acknowledges support from the NSF REU program at San Diego State University that is supported by grant AST-0850564.

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