A Red Giant Companion for the Transient 7.8 s Pulsar XTE J1829-098 ?

Details A Red Giant Companion for the Transient 7.8 s Pulsar XTE J1829-098 ? A Red Giant Companion for the Transient 7.8 s Pulsar XTE J1829-098 ?

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cxo..prop.2130h&link_type=abstract

Chandra Proposal ID #08400113

Computer Science

Chandra Proposal Id #08400113

Scientific paper

The transient 7.8 s pulsar XTE J1829-098 was discovered in a PCA scan of the Galactic plane, and despite its serendipitous detection by XMM-Newton, we have not been able to identify it optically with the expected Be star or OB supergiant. Neither are its X-ray properties compatible with an anomalous X-ray pulsar (magnetar). A more accurate Chandra position is needed to select among plausible candidates around the XMM error circle, one of which is an extremely cool M9-10 red giant, and apparently a long-period variable. If this star is the companion of XTE J1829-098, it would be the coolest red giant/X-ray binary, and its radial pulsations could cause episodic accretion onto the neutron star, whose X-ray luminosity varies by at least a factor of 1000.

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