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