AcDc – A new code for the NLTE spectral analysis of accretion discs: application to the helium CV AM CVn

Free access article

Issue		A&A Volume 428, Number 1, December II 2004


Page(s)		109 - 115
Section		Interstellar and circumstellar matter
DOI		http://dx.doi.org/10.1051/0004-6361:20041522

A&A 428, 109-115 (2004)
DOI: 10.1051/0004-6361:20041522

AcDc - A new code for the NLTE spectral analysis of accretion discs: application to the helium CV AM CVn

T. Nagel¹, S. Dreizler^{1, 2}, T. Rauch^{1, 3} and K. Werner¹

¹ Institut für Astronomie und Astrophysik, Abteilung Astronomie, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
e-mail: nagel@astro.uni-tuebingen.de
² Universitätssternwarte Göttingen, Geismarlandstr. 11, 37083 Göttingen, Germany
³ Dr.-Remeis-Sternwarte, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany

(Received 23 June 2004 / Accepted 2 August 2004)

Abstract
We present a recently developed code for detailed NLTE calculations of accretion disc spectra of cataclysmic variables and compact X-ray binaries. Assuming a radial structure of a standard $\alpha$ -disc, the disc is divided into concentric rings. For each disc ring the solution of the radiation transfer equation and the structure equations, comprising the hydrostatic and radiative equilibrium, the population of the atomic levels as well as charge and particle conservation, is done self-consistently. Metal-line blanketing and irradiation by the central object are taken into account. As a first application, we show the influence of different disc parameters on the disc spectrum for the helium cataclysmic variable AM CVn.

Key words: accretion, accretion disks -- stars: binaries: close -- stars: individual: AM CVn

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