Observations of the Newly Discovered Millisecond Accreting Pulsar XTE J1751-305

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Chandra Proposal Id #03408093

Scientific paper

Millisecond pulsars are probably the endpoint of evolution of low mass X-ray binaries (LMXBs). However, the actual detection of neutron star spin frequencies in LMXBs has been problematic, with SAX J1808.4-3658 being the only known millisecond accreting pulsar. The newly discovered source (03 Apr 2002) XTE J1751-305 was detected by RXTE PCA as a 435 Hz pulsar. Ultimately we hope to measure the orbital period and determine mass constraints for the primary and secondary stars. This will lead to constraints on population evolution of LMXBs. A position determined from the BeppoSAX WFC (by J. in 't Zand) refines the position to within 1.2 arcmin. Because this region is near the galactic center, a rapid and accurate X-ray position determination is important. This will enable prompt follow-up observations in the IR and radio bands. We request Chandra HRC-S observations in "Imaging Mode" primarily to determine the position, and also to improve the timing solution.

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