Cooling of the quasi-persistent neutron star X-ray transients KS 1731-260 and MXB 1659-29
We present Chandra and XMM-Newton X-ray observations that monitor the neutron star cooling of the quasi-persistent neutron star X-ray transients KS 1731-260 and MXB 1659-29 for approximately 4 yr after these sources returned to quiescence from prolonged outbursts. In both sources the outbursts were long enough to significantly heat the neutron star
Cackett, Edward M. et al.
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2006