Institut für Astronomie und Astrophysik Abteilung Astronomie Sand 1, D-72076 Tübingen, Germany

Preprint 09a/04

NLTE Spectral Analysis of Accretion Discs in Ultracompact X-ray Binaries

T. Nagel (1), N.J. Hammer (1), T. Rauch (1), K. Werner (1), S. Dreizler (2)

(1) Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
(2) Universitäts-Sternwarte Göttingen, Geismarlandstraße 11, 37083 Göttingen, Germany

To be published in: The Astrophysics of Cataclysmic Variables and Related Objects, ASP conference series

Abstract. We present first results of a NLTE spectral analysis of the accretion discs in the ultracompact X-ray binaries 4U 0614+091 and 4U 1626-67, performed with our accretion disc code AcDc. We show, that it is possible to give an upper limit for the abundances of hydrogen. The emission line features seen in the spectrum of 4U 1626-67 can be modeled qualitatively with irradiation of the accretion disc by the central neutron star.

Preprint (301 kb gzip'ed Postscript including figures)

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