Truth or consequences in CV evolution

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Mass transfer rates varying cyclically around a secular mean are probably required to explain the dearth of dwarf novae observed in the 3-4 hr interval just above the period gap. I show that irradiation of the secondary star can drive such cycles only if the orbital angular momentum losses increase with the mass transfer rate there (so called consequential angular momentum loss, or CAML). The SW Sex phenomenon may be a manifestation of the CAML mechanism, possibly involving a disc wind. In this case one would expect the rare dwarf novae in the period interval 3-4 hr to have higher white dwarf masses than the novalikes.

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