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DC Field | Value | Language |
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dc.contributor.author | Garcia-Hernandez, D. A | - |
dc.contributor.author | Lambert, D. L | - |
dc.contributor.author | Kameswara Rao, N | - |
dc.contributor.author | Hinkle, K. H | - |
dc.contributor.author | Eriksson, K | - |
dc.date.accessioned | 2010-04-16T10:57:02Z | - |
dc.date.available | 2010-04-16T10:57:02Z | - |
dc.date.issued | 2010-05 | - |
dc.identifier.citation | The Astrophysical Journal, Vol. 714, No. 1, pp. 144 - 154 | en |
dc.identifier.issn | 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/2248/5099 | - |
dc.description | Open Access | - |
dc.description.abstract | We investigate the relationship between R Coronae Borealis (RCB) stars and hydrogen-deficient carbon (HdC) stars by measuring precise 16O/18O ratios for five cool RCB stars. The 16O/18O ratios are derived by spectrum synthesis from high-resolution (R ~ 50, 000) K-band spectra. Lower limits to the 16O/17O and 14N/15N ratios as well as Na and S abundances (when possible) are also given. RCB stars in our sample generally display less 18O than HdC stars—the derived 16O/18O ratios range from 3 to 20. The only exception is the RCB star WX CrA, which seems to be an HdC-like star with 16O/18O = 0.3. Our result of a higher 16O/18O ratio for the RCB stars must be accounted for by a theory of the formation and evolution of HdC and RCB stars. We speculate that a late dredge-up of products of He burning, principally 12C and 16O, may convert an 18O-rich HdC star into an 18O-poor RCB star as the H-deficient star begins its final evolution from a cool supergiant to the top of the white dwarf cooling track. | en |
dc.language.iso | en | en |
dc.publisher | Institute of Physics | en |
dc.relation.uri | http://iopscience.iop.org/0004-637X/714/1/144/ | en |
dc.rights | © Institute of Physics | en |
dc.subject | Infrared: Stars | en |
dc.subject | Stars: Abundances | en |
dc.subject | Stars: Atmospheres | en |
dc.subject | Stars: Chemically Peculiar | en |
dc.subject | White Dwarfs | en |
dc.title | Oxygen isotopic ratios in cool R coronae borealis stars | en |
dc.type | Article | en |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Oxygen isotopic ratios in cool R coronae borealis stars | Open Access | 1.16 MB | Adobe PDF | View/Open |
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