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

Preprint 09b/04

Modelling C/O/Ne dominated accretion discs in ultra-compact X-ray binaries

N.J. Hammer (1), D.-J. Kusterer (1), T. Nagel (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,D-37083 Göttingen, Germany

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

Abstract. We present synthetic UV/optical NLTE spectra for the accretion disc in the ultra-compact LMXB 4U 1626-67. By assuming a radial alpha-disc structure, we perform full non-LTE radiative transfer calculations to compute the detailed vertical structure of the disc. Comparing our results with HST spectra confirms that the disc is H and He depleted, but mainly composed of C and O.

Preprint (137 kb gzip'ed Postscript including figures)

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