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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Preprint 11b/03

Modeling of Oxygen-Neon Dominated Accretion Disks in Ultracompact X-ray Binaries: 4U1626-67

K. Werner (1), T. Nagel (1), S. Dreizler (2), T. Rauch (3,1)

(1) IAAT, Universität Tübingen, Germany
(2) Universitätssternwarte Göttingen, Germany
(3) Sternwarte Bamberg, Germany

To be published in: Proc. IAU Colloquium 194 Compact binaries in The Galaxy and beyond, in Revista Mexicana de Astronomia y Astrofisica, Conference Series

Abstract. We report on first results of computing synthetic spectra from H/He-poor accretion disks in ultracompact LMXBs. We aim at the determination of the chemical composition of the very low-mass donor star, which is the core of a former C/O white dwarf. The abundance analysis allows to draw conclusions on gravitational settling in WDs which is an important process affecting cooling times and pulsational g-mode periods.
Key words: Accretion disks, Binaries: close, White dwarfs

Preprint (105 kb PDF file including figures)
Astrophysics (astro-ph): astro-ph/0312561

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