High Resolution Photospheric Spectroscopy of the Neutron Star in EXO0748-676

Details High Resolution Photospheric Spectroscopy of the Neutron Star in EXO0748-676 High Resolution Photospheric Spectroscopy of the Neutron Star in EXO0748-676

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1428p&link_type=abstract

Chandra Proposal ID #05400594

Physics

Chandra Proposal Id #05400594

Scientific paper

Recently, we discovered narrow absorption features in the spectrum of 28 X-ray bursts from the neutron star in the LMXB EXO0748-676, whose properties point to a photospheric origin. The transition wavelengths are consistent with the n=2-3 lines in H- and He-like Fe, exhibiting a gravitational redshift of z=0.35. The measured line strengths indicate that the lines are significantly broadened by the Stark effect, and this will ultimately provide an opportunity to determine both the mass and the radius of this neutron star. Here we propose a very deep spectroscopic observation with Chandra HETGS, to detect the Fe Lyman spectrum and obtain crucial independent spectroscopic confirmation for the Balmer line identification, and to measure the spin period of the neutron star.

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