Spectroscopy of the High-Latitude Accreting Millisecond Pulsar XTE J0929-314

Details Spectroscopy of the High-Latitude Accreting Millisecond Pulsar XTE J0929-314 Spectroscopy of the High-Latitude Accreting Millisecond Pulsar XTE J0929-314

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1107c&link_type=abstract

Chandra Proposal ID #03408100

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Chandra Proposal Id #03408100

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The 3rd msec X-ray pulsar, XTE J0929-314 (Pspin=5.4 ms, Porb=43 min) was just discovered (IAUC 7893). Along with the other two (SAX J1808.4-3658, Pspin=2.5 ms, Porb=2 hr; XTE J1751-305, Pspin=2.3 ms, Porb=42 min), this establishes a pattern of msec pulsars being found in very close binaries. The donors in ultracompact binaries (Porb < 80 min) are H-poor and likely degenerate. As seen in CXO observations of the ultracompact 4U 1626-67 (Schulz et al. 2001, ApJ), this exotic composition can be traced through X-ray spectroscopy. The source (like 1626) is high-latitude (14 deg) and low-column (Nh<1e21), making it an ideal target. (J1751 was at Galactic ctr!) From orbital size, a C-O or O-Ne-Mg donor is likely. We request LETG/ACIS spectra to search for emission lines and absorption edges. (ACIS for larger area <50 A.) We also hope to compare the edges with HST UV Ly-alpha measurement of Nh (HST DDT prop submitted) to explore local composition (cf. 1626 paper).

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