Localizing the Transient 89 Second Pulsar XTE J1906+09

Physics

Scientific paper

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Chandra Proposal Id #04400302

Scientific paper

We propose a 15 ks ACIS-I observation to yield an arcsecond position for the transient 89-s pulsar XTE J1906+09. RXTE scans located the source within 2', and indicated a possible 28 day sinusoidal variation in the pulse arrival times. Recurrent transient pulsars are almost always found in high mass Be-binary systems, but a search in Simbad reveals no O or B stars within 10'. To add to the mystery, Corbet's P{spin}/P{orbit} correlation for recurrent transient pulsars would predict a 100 day orbital period, not 28 days or 2 years (the recurrence time). The Chandra precision position will allow for identification of the counterpart, and we will follow-up with infrared observations to determine the characteristics of the binary system.

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