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Accretion disc models for AM Canum Venaticorum systems
W. El-Khoury and
Received 16 November 1999 / Accepted 16 March 2000
Using a model of the vertical structure of accretion discs, we calculate disc spectra across a range of system parameters for the helium-rich AM CVn cataclysmic variables, and investigate thermal instabilities in their discs.
Applying a -minimisation technique, predicted HeI and HI continuum and line profiles are compared with those observed for two such systems, AM CVn and CR Boo, to estimate several system parameters. We find:
S-curves calculated for the best-fit models are consistent with a thermally-stable disc in AM CVn, and a thermally unstable disc in CR Boo.
Key words: stars: individual: AM CVn, CR Boo stars: novae, cataclysmic variables stars: evolution stars: binaries: general
Send offprint requests to: W. El-Khoury
Online publication: June 26, 2000