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CNO ABUNDANCES OF HYDROGEN-DEFICIENT CARBON AND R CORONAE BOREALIS STARS: A VIEW OF THE NUCLEOSYNTHESIS IN A WHITE DWARF MERGER
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2009 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 696, no 2, 1733-1754 p.Article in journal (Refereed) Published
Abstract [en]

We present high-resolution (R similar to 50,000) observations of near-IR transitions of CO and CN of the five known hydrogen-deficient carbon (HdC) stars and four R Coronae Borealis (RCB) stars. We perform an abundance analysis of these stars by using spectrum synthesis and state-of-the-art MARCS model atmospheres for cool hydrogen-deficient stars. Our analysis confirms reports by Clayton and colleagues that those HdC stars exhibiting CO lines in their spectrum and the cool RCB star SAps are strongly enriched in O-18(with O-16/(18)Oratios ranging from 0.3 to 16). Nitrogen and carbon are in the form of N-14 and C-12, respectively. Elemental abundances for CNO are obtained from C I, Ci2, CN, and CO lines. Difficulties in deriving the carbon abundance are discussed. Abundances of Na from Na I lines and S from S I lines are obtained. Elemental and isotopic CNO abundances suggest that HdC and RCB stars may be related objects, and that they probably formed from a merger of an He white dwarf with a C-O white dwarf.

Place, publisher, year, edition, pages
2009. Vol. 696, no 2, 1733-1754 p.
Keyword [en]
infrared: stars, stars: abundances, stars: atmospheres, stars: chemically peculiar, white dwarfs
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-129072DOI: 10.1088/0004-637X/696/2/1733ISI: 000265762700059OAI: oai:DiVA.org:uu-129072DiVA: diva2:337542
Available from: 2010-08-06 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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