SIMBAD references

1998A&A...340..431O - Astronomy and Astrophysics, volume 340, 431-436 (1998/12-2)

The 1998 outburst of the X-ray transient 4U 1630-47 observed with BeppoSAX.

OOSTERBROEK T., PARMAR A.N., KUULKERS E., BELLONI T., VAN DER KLIS M., FRONTERA F. and SANTANGELO A.

Abstract (from CDS):

We report results of five pointed BeppoSAX observations of the black hole candidate 4U 1630-47 during part of its 1998 outburst when the 2-10keV source luminosity decreased from 2.1x1038erg/s (for an assumed distance of 10kpc) by a factor of ∼7. The 2-200keV spectrum can be modeled by a soft multi-temperature disk blackbody and a hard power-law. During four of the observations, there is evidence for deviations from a pure power-law shape >20keV which may be due to reflection. As the outburst decayed a number of spectral trends are evident: (1) the amount of photoelectric absorption decreased, (2) the spectrum became harder (i.e. the power-law index became smaller), (3) the temperature of the disk blackbody decreased and (4) the inferred inner disk radius increased by a factor of ∼4. The change in the accretion disk inner radius during the outburst is in contrast to results from other soft X-ray transients. We find that the disk blackbody temperature depends on the inner disk radius roughly as T∝r–3/4. For a standard Shakura-Sunyaev disk model this implies that the inferred mass accretion rate at the inner disk radius did not change appreciably during the part of the outburst observed by BeppoSAX.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: individual: 4U 1630-47

Simbad objects: 7

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