Cantrell, Andrew G. and Bailyn, Charles D. and Orosz, Jerome A. and McClintock, Jeffrey E. and Remillard, Ronald A. and Froning, Cynthia S. and Neilsen, Joseph and Gelino, Dawn M. and Gou, Lijun (2010) The Inclination of the Soft X-Ray Transient A0620–00 and the Mass of its Black Hole. Astrophysical Journal, 710 (2). pp. 1127-1141. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20100224-112229738
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We analyze photometry of the soft X-ray transient A0620 – 00 spanning nearly 30 years, including previously published and previously unpublished data. Previous attempts to determine the inclination of A0620 using subsets of these data have yielded a wide range of measured values of i. Differences in the measured value of i have been due to changes in the shape of the light curve and uncertainty regarding the contamination from the disk. We give a new technique for estimating the disk fraction and find that disk light is significant in all light curves, even in the infrared. We also find that all changes in the shape and normalization of the light curve originate in a variable disk component. After accounting for this disk component, we find that all the data, including light curves of significantly different shapes, point to a consistent value of i. Combining results from many separate data sets, we find i = 51.°0 ± 0.°9, implying M = 6.6 ± 0.25 M_⊙. Using our dynamical model and zero-disk stellar VIH magnitudes, we find d = 1.06 ± 0.12 kpc. Understanding the disk origin of nonellipsoidal variability may assist with making reliable determinations of i in other systems, and the fluctuations in disk light may provide a new observational tool for understanding the three-dimensional structure of the accretion disk.
|Additional Information:||© 2010 The American Astronomical Society. Received 2009 August 28; accepted 2009 December 30; published 2010 January 27. This work was supported by NSF Graduate Research Fellowship DGE-0202738 to AGC and NSF/AST grants 0407063 and 0707627 to CDB.|
|Subject Keywords:||accretion, accretion disks; stars: individual (A0620 – 00); X-rays: binaries|
|Official Citation:||The Inclination of the Soft X-Ray Transient A0620–00 and the Mass of its Black Hole Andrew G. Cantrell, Charles D. Bailyn, Jerome A. Orosz, Jeffrey E. McClintock, Ronald A. Remillard, Cynthia S. Froning, Joseph Neilsen, Dawn M. Gelino, and Lijun Gou 2010 ApJ 710 1127-1141 doi: 10.1088/0004-637X/710/2/1127|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||02 Mar 2010 17:47|
|Last Modified:||26 Dec 2012 11:47|
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