4U 1957+11: a persistent low-mass X-ray binary and black-hole candidate in the high state?
arXiv:astro-ph/0104395 · doi:10.1046/j.1365-8711.2002.05137.x
Abstract
We report on several pointed Rossi X-ray Timing Explorer observations of the enigmatic low-mass X-ray binary (LMXB) 4U 1957+11 at different X-ray luminosities. The luminosity of the source varied by more than a factor of four on time scales of months to years. The spectrum of the source tends to get harder when its luminosity increases. Only very weak (1%-2% rms amplitude; 0.001-10 Hz; 2-60 keV) rapid X-ray variability was observed during the observations. A comparison of the spectral and temporal behaviour of 4U1957+11 with other X-ray binary systems, in particular LMC X-3, indicates that 4U 1957+11 is likely to be a persistent LMXB harboring a black hole and which is persistently in the black-hole high state. If confirmed, it would be the only such system known.
Accepted for publication in MNRAS, 8 Nov. 2001
References in corpus (2)
Cited by in corpus (19)
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