Timing the Enigmatic Nearby Neutron Star RX J1308.8+2127

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Chandra Proposal Id #06500265

Scientific paper

The nearest neutron stars identified by their thermal X-ray emission provide us the best sample to measure the true demography of neutron stars. The bright soft X-ray source RX J1308.8+2127, with a period of 10-s and a double-peaked pulse profile, is distinguished from both traditional radio pulsars and from other radio-quiet neutron stars. Current data allow 3 models: a pulsar born with the unexpectedly long period of 10 s; a remarkably high B-field (1e13 G) pulsar; or an old magnetar with an even higher magnetic field. The period derivative provides a clean and clear discriminant of the models. We propose an optimally designed set of timing observations which, when combined with existing data, will choose between these models and thus resolve the nature of this source.

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