Is Gx 339 � 4 a Black Hole Candidate ? Optical Spectroscopy
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چکیده
We carried out spectroscopic and photometric observations of the candidate black-hole binary GX 339?4 during its low-hard and high-soft X-ray states. We have found that the emission lines from GX 339?4 have asymmetric, apparently round-topped prooles in the low-hard state (1997 May), and double-peaked prooles in the high-soft state (1998 April and August). Our data do not show obvious velocity modulations of the emission lines from the compact object, nor any absorption lines from the secondary star. The B and V light-curves in a high-soft state (1998 May, July and August) show variations by several tenths of a magnitude around a mean value of B 17:3, V 16:5, on timescales of a few hours. Observations during a low-hard state (1999 February) yield B 18:0, V 17:1. GX 339?4 is likely to have a low-mass secondary and a low orbital inclination.
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تاریخ انتشار 2007