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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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.

Original languageAmerican English
Pages (from-to)2411-2419
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume427
Issue number3
DOIs
StatePublished - 11 Dec 2012

Keywords

  • Convection
  • Hydrodynamics
  • Instabilities
  • Stars: abundances
  • Stars: dwarf novae

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