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Title:
Mass transfer in tidally unstable compact binaries
Authors:
Truss, M. R.
Affiliation:
AA(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 356, Issue 4, pp. 1471-1476. (MNRAS Homepage)
Publication Date:
02/2005
Origin:
MNRAS
Astronomy Keywords:
accretion, accretion discs, binaries: close, stars: individual: WZ Sagittae, novae, cataclysmic variables
DOI:
10.1111/j.1365-2966.2004.08582.x
Bibliographic Code:
2005MNRAS.356.1471T

Abstract

The 2001 outburst of WZ Sagittae has shown the most compelling evidence yet for an enhancement of the mass-transfer rate from the donor star during a dwarf nova outburst in the form of hotspot brightening. I show that, even in this extreme case, the brightening can be attributed to tidal heating near the interaction point of an accretion stream with the expanding edge of an eccentric accretion disc, with no need at all for an increase in the mass-transfer rate. Furthermore, I confirm previous suggestions that an increase in mass-transfer rate through the stream damps any eccentricity in an accretion disc and suppresses the appearance of superhumps, in contradiction to observations. Tidal heating is expected to be most significant in systems with small mass ratios. It follows that systems like WZ Sagittae - which has a tiny mass ratio - are those most likely to show a brightening in the hotspot region.

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