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

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Gelino D., Balman S., Kiziloglu U., Yilmaz A., Kalemci E., Tomsick J.

ASTROPHYSICAL JOURNAL, cilt.642, sa.1, ss.438-442, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 642 Sayı: 1
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1086/500924
  • Dergi Adı: ASTROPHYSICAL JOURNAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.438-442
  • Anahtar Kelimeler: binaries : close, infrared : stars, stars : individual (XTE J1118+480), stars : variables : other, X-rays : binaries, X-RAY, GRO J0422+32, LIGHT CURVES, QUIESCENCE, STARS, MULTIWAVELENGTH, XTE-J1118+480, PHOTOMETRY
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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 K-s-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 68 degrees +/- 2 degrees. This inclination angle corresponds to a primary black hole mass of 8: 53 +/- 0: 60 M-circle dot. 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.