X-Ray Diagnostics of the Wind of HMXB X1908+075: Possible Progenitor Bh-Ns System

Details X-Ray Diagnostics of the Wind of HMXB X1908+075: Possible Progenitor Bh-Ns System X-Ray Diagnostics of the Wind of HMXB X1908+075: Possible Progenitor Bh-Ns System

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1677r&link_type=abstract

Chandra Proposal ID #06400334

Computer Science

Chandra Proposal Id #06400334

Scientific paper

The X-ray binary X1908+075 contains an accreting pulsar orbiting in a dense stellar wind; the column density to the neutron star varies by a factor of 5 from inferior to superior conjunction. An estimate of the mass flux in the wind suggests that the companion may be a Wolf-Rayet star rather than an ordinary OB star. If so, this system could be the first known progenitor of a black hole/neutron star binary, where the neutron star formed first. We propose HETG observations to characterize the wind in detail through both the low energy cutoff of the continuum and the emission lines expected to be produced by photoionization and fluorescence, and to obtain a precise position. The X-ray spectroscopy and followup IR spectroscopy will yield important clues to the nature of the companion.

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