Journal Article

Convective overshoot mixing in Nova outbursts – the dependence on the composition of the underlying white dwarf

S. Ami Glasner, Eli Livne and James W. Truran

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 3, pages 2411-2419
Published in print December 2012 | ISSN: 0035-8711
Published online December 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.22103.x
Convective overshoot mixing in Nova outbursts – the dependence on the composition of the underlying white dwarf

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Abstract

We present here, for the first time, a 2D study of the overshoot convective mechanism in nova outbursts for a wide range of possible compositions of the layer underlying the accreted envelope. Previous surveys studied this mechanism only for solar composition matter accreted on top of carbon–oxygen (C–O) white dwarfs. Since, during the runaway, mixing with carbon enhances the hydrogen burning rates dramatically, one should question whether significant enrichment of the ejecta is possible also for other underlying compositions (He, O, Ne, Mg), predicted by stellar evolution models. We simulated several non-carbon cases and found significant amounts of those underlying materials in the ejected hydrogen layer. Despite large differences in rates, time-scales and energetics between the cases, our results show that the convective dredge-up mechanism predicts significant enrichment in all our non-carbon cases, including helium enrichment in recurrent novae. The results are consistent with observations.

Keywords: convection; hydrodynamics; instabilities; stars: abundances; stars: dwarf novae

Journal Article.  5394 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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