Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201..345b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 201, Oct. 1982, p. 345-355.
Astronomy and Astrophysics
Astronomy
45
Accretion Disks, Binary Stars, Giant Stars, Stellar Evolution, Stellar Mass Accretion, Stellar Models, Light Curve, Main Sequence Stars, Stellar Gravitation, Stellar Luminosity, Stellar Temperature, Time Dependence
Scientific paper
The structure of time-dependent accretion discs in giant binaries with separation about 10 to the 13th cm is examined. Radiative alpha-viscosity discs with alpha of order unity accreting on to main-sequence stars at accretion rates which generate luminosities greater than a giant companion decay on time-scales of the same order as the binary period, unlike those in dwarf nova binaries which decay on time-scales 100 times longer than the binary period. This results from the lower gravitational potential and consequent larger disc thickness (relative to the radius) of luminous 'giant' discs accreting at high accretion rates. The eruptions of the symbiotic binary C I Cygni are modelled by an alpha = 1 disc with outer radius 8.5 x 10 to the 12th cm and a sequence of five mass-transfer bursts at rates between 1.5 x 10 to the 21st and 4 x 10 to the 22nd g/s.
Bath Geoffrey T.
Pringle James E.
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