Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chfe.sympe..14w&link_type=abstract
Chandra Fellows Symposium 2001, held 15 October, 2001 at Harvard-Smithsonian Center for Astrophysics, meeting abstract.
Astronomy and Astrophysics
Astrophysics
Scientific paper
The neutron-star X-ray transient KS 1731-260 was discovered in August of 1989 and until recently, the source was persistently bright in X-rays. In January of 2001, the source suddenly returned to quiescence again after more than a decade of actively accreting. I present the results of a Chandra/ACIS-S observation of KS 1731-260 performed just a few weeks after this transition. The source was detected in quiescence at a luminosity and a blackbody temperature which are very similar to those obtained for the normal short-duration neutron-star X-ray transients. If the prolonged accretion in KS 1731-260 had heated the neutron star to a higher temperature than those obtained for the neutron stars in ordinary transients, then a higher luminosity and temperature would be expected (assuming that KS 1731-260 is very similar to those other systems in all other aspects, like age and recurrence time of the outbursts). I will discuss these results in the context of the quiescent X-ray emission mechanisms (such as cooling models, residual accretion in quiescence) in neutron-star X-ray transients.
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