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Title:
High-resolution spectroscopy of the low-mass X-ray binary EXO 0748-67
Authors:
Cottam, J.; Kahn, S. M.; Brinkman, A. C.; den Herder, J. W.; Erd, C.
Affiliation:
AA(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA), AB(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA), AC(Space Research Organization of The Netherlands, Laboratory for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands), AD(Space Research Organization of The Netherlands, Laboratory for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands), AE(Astrophysics Division, Space Science Department of ESA, ESTEC, 2200 AG Noordwijk, The Netherlands)
Publication:
Astronomy and Astrophysics, v.365, p.L277-L281 (2001) (A&A Homepage)
Publication Date:
01/2001
Origin:
EDP Sciences
A&A Keywords:
STARS: INDIVIDUAL: EXO 0748-67, BINARIES: ECLIPSING, X-RAYS: STARS
DOI:
10.1051/0004-6361:20000053
Bibliographic Code:
2001A&A...365L.277C

Abstract

We present initial results from observations of the low-mass X-ray binary EXO 0748-67 with the Reflection Grating Spectrometer on board the XMM-Newton Observatory. The spectra exhibit discrete structure due to absorption and emission from ionized neon, oxygen, and nitrogen. We use the quantitative constraints imposed by the spectral features to develop an empirical model of the circumsource material. This consists of a thickened accretion disk with emission and absorption in the plasma orbiting high above the binary plane. This model presents challenges to current theories of accretion in X-ray binary systems.
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