Other
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1868g&link_type=abstract
Chandra Proposal ID #06408215
Other
Chandra Proposal Id #06408215
Scientific paper
The visibility of persistent pulsations in accretion-powered millisecond pulsars (in contrast to other LMXBs) suggests that surface spectral features might also be more easily detectable. SAX J1808.4-3658 is the closest of the three MSPs with H-rich donors; three more are ultracompact and likely accrete primarily He from degenerate companions. Surface spectral features may arise from freshly accreted material and the products of spallation reactions, the rate of which may be greater for H-rich accretors (L. Bildsten, pers. comm.). Although no high signal-to-noise HETGS spectrum of SAX J1808.4-3658 has been taken, an opportunity to obtain such a spectrum has arisen with the early detection of a new outburst on 1 June (ATel #505). We propose to observe the source with the HETGS for 22 ks in order to 1) search for discrete emission and absorption features, 2) characterize the neutral absorption edges and 3) test for flux and spectral feature variation at the 2.01 hr orbital period.
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