18O and the Origins of HdC and R CrB Stars

Details 18O and the Origins of HdC and R CrB Stars 18O and the Origins of HdC and R CrB Stars

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..391...51g&link_type=abstract

Hydrogen-Deficient Stars ASP Conference Series, Vol. 391, proceedings of the conference held 17-21 September, 2007, at Eberhard

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Scientific paper

We have detected enormously enhanced 18O and correspondingly small values of 16O/18O in many hydrogen-deficient carbon (HdC) stars and R Coronae Borealis (R CrB) stars. The similar ratios suggest a common origin for the two types of stars. Of the two leading candidates for the origin of R CrB stars, white dwarf mergers and final helium flashes, the former appears more likely to produce this and other observed isotopic anomalies.

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