Observation of an Orbiting Photoionized Plasma in EXO 0748-676 with the Chandra HETG

Details Observation of an Orbiting Photoionized Plasma in EXO 0748-676 with the Chandra HETG Observation of an Orbiting Photoionized Plasma in EXO 0748-676 with the Chandra HETG

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20112905j&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #129.05; Bulletin of the American Astronomical Society, Vol. 34, p.1314

Astronomy and Astrophysics

Astronomy

Scientific paper

The high-resolution X-ray spectra of the persistent and dip phases of this low-mass X-ray binary system reveal emission and absorption features from a photoionized plasma. The spectra were obtained in a 48 ks observation with the Chandra HETG. The velocity broadening of the line emission from highly ionized Mg, Ne and O is likely due to orbital motion around the neutron star. The spectral evidence implies that the intensity dips are due to a variable column of gas composed of both neutral and ionized material. The X-ray recombination emission can be produced in an extended accretion disk atmosphere and corona.

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