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The inclination angle and mass of the black hole in XTE J1118+480

Gelino, Dawn M. and Balman, Solen and Kiziloglu, Umit and Yilmaz, Arda and Kalemci, Emrah and Tomsick, John A. (2008) The inclination angle and mass of the black hole in XTE J1118+480. In: A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments, St. Pete Beach, FL, 28–2 November 2007. AIP Conference Proceedings. No.1010. American Institute of Physics , Melville, NY, pp. 82-84. ISBN 978-0-7354-0530-1.

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We have obtained optical and infrared photometry of the quiescent soft X-ray transient XTE J1118+480. In addition to optical and J-band variations, we present H- and Ks-band ellipsoidal variations for this system. We model the variations in all bands simultaneously with the WD98 light curve modeling code. The infrared colors of the secondary star in this system are consistent with those of a K7 V, while there is evidence for light from the accretion disk in the optical. Combining the models with the observed spectral energy distribution of the system, the most likely value for the orbital inclination angle is 68 degrees ±2 degrees. This inclination angle corresponds to a primary black hole mass of 8.53+/-0.60 M☉. Based on the derived physical parameters and infrared colors of the system, we determine a distance of 1.72+/-0.10 kpc to XTE J1118+480.

Item Type:Book Section
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URLURL TypeDescription
Gelino, Dawn M.0000-0003-1274-2784
Tomsick, John A.0000-0001-5506-9855
Additional Information:© 2008 American Institute of Physics. Issue Date: 23 May 2008.
Group:Infrared Processing and Analysis Center (IPAC)
Subject Keywords:accretion disks; black holes; stellar mass; stellar photometry; stellar spectra
Series Name:AIP Conference Proceedings
Issue or Number:1010
Record Number:CaltechAUTHORS:GELaipcp08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13281
Deposited By: Tony Diaz
Deposited On:09 Feb 2009 23:51
Last Modified:09 Mar 2020 13:19

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