Accretion disk radii in cataclysmic variables

Details Accretion disk radii in cataclysmic variables Accretion disk radii in cataclysmic variables

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..579s&link_type=abstract

Astrophysical Journal, Part 1, vol. 244, Mar. 1, 1981, p. 579-581.

Astronomy and Astrophysics

Astrophysics

63

Astrometry, Dwarf Stars, Eclipsing Binary Stars, Stellar Mass Accretion, Variable Stars, Light Curve, Radii, Roche Limit

Scientific paper

It is shown that it is possible to determine the sizes of accretion disks in eclipsing cataclysmic variables by timing the first and last contacts of the eclipses. The resulting disk radius is approximately proportional to the length of the eclipse but is only very weakly dependent on q, the poorly known mass ratio of the system. The binary inclination i is important and unknown, but by assuming i = 90 deg it is possible to obtain the smallest disk that will reproduce the observed light curve. Thus it is possible to determine a lower bound to the disk (expressed in terms of the primary's Roche lobe radius) with an accuracy of about 10%, even when nothing else is known about the system.

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