The symptoms and causes of CV low-states

Details The symptoms and causes of CV low-states The symptoms and causes of CV low-states

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000newar..44..155h&link_type=abstract

New Astronomy Reviews, Volume 44, Issue 1-2, p. 155-160.

Astronomy and Astrophysics

Astronomy

7

Scientific paper

I present recent results on the symptoms and causes of extended photometric low-states seen in a large fraction of cataclysmic variables and particularly well in AM Her stars. The most likely cause of low-states - stellar starspots on the secondary stars appearing at the L1-point - implies that the light curves of AM Her stars can be used to constrain the spottedness of the secondaries. Using the AAVSO light and a flux-dependent bolometric correction, a statistical model for the spots near the L1-point of AM Her itself is derived. The implied density of spots can only be explained if the spottedness of the L1-point is unusual, for instance if the observed prominences are forced to wandering down the Roche potential towards the L1-point. The polar results can be easily applied to VY Scl low-states if the latter stars contain hot white dwarfs: the irradiated discs can be rapidly drained of material, preventing the occurrence of dwarf nova eruptions during near total cessations of mass-transfer.

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