Evidence of a Black Hole in the X-Ray Transient GS 1354-64 (=BW Circini)

  title={Evidence of a Black Hole in the X-Ray Transient GS 1354-64 (=BW Circini)},
  author={Jorge Casares and Cristina Zurita and Tariq Shahbaz and Philip A. Charles and Robert P. Fender},
  journal={The Astrophysical Journal},
We present the first radial velocity curve of the companion star to BW Cir that demonstrates the presence of a black hole in this X-ray transient that recorded outbursts in 1987 and 1997 (and possibly 1971-1972). We identify weak absorption features corresponding to a G0-5 III donor star, strongly veiled by a residual accretion disk that contributes 61%-65% of the total light at 6300 A. The Doppler motions of these features trace an orbit of P = 2.54448 days (or its 1 yr alias of P = 2.56358… 

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