Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...358..154e&link_type=abstract
Astronomy and Astrophysics, v.358, p.154-168 (2000)
Astronomy and Astrophysics
Astrophysics
20
Stars: Individual: Am Cvn, Cr Boo, Stars: Novae, Cataclysmic Variables, Stars: Evolution, Stars: Binaries: General
Scientific paper
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 chi 2-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: mean accretor masses close to, but somewhat higher than, the 0.7-0.8 M_sun range predicted by present population synthesis studies; typical helium-to-hydrogen number density ratios of 102-104, consistent with a helium-degenerate donor surrounded by a helium-rich envelope; and mass-transfer rates of about 1017gs-1, which may place the systems in the region of potential disc instability. 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.
El-Khoury Walid
Wickramasinghe Dayal
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