Physics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264..411y&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 264, NO.2/SEP15, P. 411, 1993
Physics
18
Accretion, Accretion Discs - Black Hole Physics - Binaries: Close - Stars: Individual: X1957+11 - Stars: Neutron - X-Rays: Stars
Scientific paper
The X-ray source X1957+11 has an unusually soft X-ray spectrum, very similar to the X-ray spectra of Galactic black hole candidates. We report on a recent Ginga observation of X1957+11, the first X-ray observation since HEAO-1, and find significant spectral variability, on time-scales of hours, in the sense that the spectrum becomes harder as the luminosity increases. We model the spectrum with a two-component model: a soft component associated with the disc emission and a hard component which is best described by a power law. The spectral variability is predominantly due to changes in the hard component while the soft component remains relatively stable. Recent results suggest that Galactic black hole candidates might be distinguished from X-ray binary systems in which the compact object is a neutron star by their X-ray spectral signatures alone. We discuss the extent to which this may be true and compare the results of our spectral analysis for X1957+11 with those for other low-mass X-ray binary systems (LMXBs) and black hole candidates, and argue that the compact object in X1957+11 is likely to be a neutron star.
Ebisawa Ken
Mitsuda Kazu
Yaqoob Tahir
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