AAS 201st Meeting, January, 2003
Session 129. LMXB's and Transient Sky
Oral, Thursday, January 9, 2003, 10:00-11:30am, 616-617

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

M. A. Jimenez-Garate, N. S. Schulz, H. L. Marshall (MIT)

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.

The author(s) of this abstract have provided an email address for comments about the abstract: mario@space.mit.edu

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