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| Paper: |
Long-duration Neutron Star X-ray Transients in quiescence: the Chandra Observation of KS 1731-260 |
| Volume: |
262, The High Energy Universe at Sharp Focus: Chandra Science |
| Page: |
235 |
| Authors: |
Wijnands, R. |
| Abstract: |
The neutron-star X-ray transient KS 1731-260 was discovered in August of 1989. Until recently, the source was seen presistently bright in X-rays. But in January of 2001, the source suddenly returned back to quiescence again after more than a decade of actively accreting. We present a Chandra/ACIS-S observation of KS 1731-260 just a few weeks after this transition. We detected the source in quiescence at a luminosity and a blackbody temperature which are very similar to those obtained for the normal short-lived neutron-star X-ray transients. If the prolonged accretion in KS 1731-260 had heated up 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. We will discuss our 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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