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

Gelino, Dawn M. and Balman, Şölen and Kızıloğlu, Ümit and Yılmaz, Arda and Kalemci, Emrah and Tomsick, John A. (2006) The inclination angle and mass of the black hole in XTE J1118+480. Astrophysical Journal, 642 (issue 1 part 1). pp. 438-442. ISSN 0004637

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Official URL: http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v642n1/20031/20031.html


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 the first observed 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 a spectral type of 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 68deg+/-2deg. This inclination angle corresponds to a primary black hole mass of 8.53+/-0.60 Msolar. 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:Article
Uncontrolled Keywords:binaries : close; infrared : stars; stars : individual (XTE J1118+480); stars : variables : other; X-rays : binaries
Subjects:Q Science > QB Astronomy
Q Science > QC Physics
ID Code:6442
Deposited By:Emrah Kalemci
Deposited On:25 Oct 2007 22:54
Last Modified:25 May 2011 14:02

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