a Chandra Observation of the Long-Duration Transient and Neutron Star Low-Mass X-Ray Binary KS 1731-260 in Quiescence

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Chandra Proposal Id #02408040

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The full scientific justification is sent in an email to the Director. The long-duration transient KS 1731-260 has been active for over a decade, however, our recent RXTE/PCA observations show that the source has now gone back in to quiescence. This opens the oppertunity to study the affects of prolonged accretion onto the neutron star on the quiescence X-ray properties of a neutron star X-ray transient. This would be the first time ever that such a study can be performed. Considerable differences (e.g., a considerable higher luminosity compared to that of short-duration transients) are expected if the quiescence properties depend on the time averaged accretion rate in outburst. We will also obtain an excellent position of the source allowing the identification of its optical and infrared counter parts.

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