Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..212v&link_type=abstract
Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he
Astronomy and Astrophysics
Astrophysics
Scientific paper
Dwarf novae (DN) are a subfamily of cataclysmic variable, i.e. binary stellar systems where a white dwarf accretes matter through an accretion disc from a stellar companion. They undergo regular outbursts lasting a few days with a recurrence time of a few ten days. The outburst phenomenon is best interpreted as being due to a thermal/viscous limit cycle of the accretion disc. The general framework of the disc instability is now well understood, but some points are still unclear. In particular, the possibility that the illumination of the secondary atmosphere leads to an enhancement of the mass transfer rate is still under debate. We present here the first 2D hydrodynamic simulations of the surface flows in the secondary that result from the strong inhomogenous heating of the atmosphere during outbursts. We also discuss the possibility that the L1 point, from which matter leaves the secondary, is directly heated by the disc rim. During an outburst this could in turn contribute to the mass transfer enhancement.
Hameury Jean-Marie
Viallet Marianne
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