The Burst Spectra of EXO 0748-676 during a Long 2003 XMM-Newton Observation

Details The Burst Spectra of EXO 0748-676 during a Long 2003 XMM-Newton Observation The Burst Spectra of EXO 0748-676 during a Long 2003 XMM-Newton Observation

2007-09-25

arxiv.org/abs/0709.4062v1

Astronomy and Astrophysics

Astrophysics

18 Pages, 3 Figures. Accepted for publication in ApJ

Scientific paper

10.1086/524186

Gravitationally redshifted absorption lines from highly ionized iron have been previously identified in the burst spectra of the neutron star in EXO 0748-676. To repeat this detection we obtained a long, nearly 600 ks observation of the source with XMM-Newton in 2003. The spectral features seen in the burst spectra from the initial data are not reproduced in the burst spectra from this new data. In this paper we present the spectra from the 2003 observations and discuss the sensitivity of the absorption structure to changes in the photospheric conditions.

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