The HdC stars as recently merged white dwarf binaries

Details The HdC stars as recently merged white dwarf binaries The HdC stars as recently merged white dwarf binaries

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..391h&link_type=abstract

NOAO Proposal ID #2006A-0391

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Scientific paper

The hydrogen-deficient carbon star HD 137613 has been reported by Clayton et al. (2005) to have the extraordinary isotopic ratio ^16O/^18O ~ 0.8. The solar system ratio is ~500 and carbon stars typically have yet larger ratios. The explanation proposed for the ^16O/^18O value observed in HD 137613 is that the HdC stars are recently merged white dwarf binaries. The observed supergiant HdC star is a transient post-merger phase. If so, we have the rare opportunity to see helium-burning shell products in a low gravity stellar environment. To test this model we propose to measure the CNO elemental abundances for HD 137613 as well as the other four hydrogen- deficient carbon stars. Comparison of the measure abundances with models will lead to considerable insight into stellar mergers and nucleosynthesis.

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