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A Small Step on the Long Road to Understanding the R Stars: CNO Cycling in Candidate R Star Progenitors

Published online by Cambridge University Press:  05 March 2013

G. Angelou  and
J. Lattanzio
G. Angelou
Affiliation:
Centre for Stellar and Planetary Astrophysics, School of Mathematical Sciences, Monash University, Melbourne, VIC 3800, Australia
J. Lattanzio*
Affiliation:
Centre for Stellar and Planetary Astrophysics, School of Mathematical Sciences, Monash University, Melbourne, VIC 3800, Australia
*
BCorresponding author. Email: john.lattanzio@sci.monash.edu.au
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Abstract

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Recent work has proposed that a merger event between a red-giant and a He white dwarf may be responsible for the production of R stars (Izzard, Jeffery & Lattanzio 2007). We investigate the proposed evolution and nucleosynthesis of such a model. We simulate the hypothesized late ignition of the core flash by increasing neutrino losses until ignition occurs sufficiently far from the centre that the subsequent evolution produces carbon dredge-up to the extent that the post-flash object is a carbon star. Detailed nucleosynthesis is performed within this approximation and we show that the overall properties are broadly consistent with the observations. Details will depend on the dynamics of the merger event.

Keywords

stars: evolutionstars: nucleosynthesisR starsHe core flash
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 25 , Issue 4 , 2008 , pp. 155 - 160
Copyright
Copyright © Astronomical Society of Australia 2008

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