First overtone CO bands in the giant component of RS Ophiuchi: the 12C/13C ratio in 2008

We present an analysis of a high-resolution (R≃ 40 000) infrared spectrum of the RS Oph secondary around the first overtone CO bands, obtained in 2008 May on the Gemini-South 8 m telescope. The 12CO and 13CO bands are well resolved, and we compute synthetic spectra to determine the 12C/13C ratio. We...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2010-05, Vol.404 (1), p.206-211
Main Authors: Pavlenko, Ya. V., Woodward, Charles E., Rushton, M. T., Kaminsky, B., Evans, A.
Format: Article
Language:English
Subjects:
Astrophysics
binaries: symbiotic
cataclysmic variables
Chemical elements
Double stars
Infrared imaging systems
novae
novae, cataclysmic variables
Spectrum analysis
Star & galaxy formation
stars: abundances
stars: individual: RS Oph
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Summary:We present an analysis of a high-resolution (R≃ 40 000) infrared spectrum of the RS Oph secondary around the first overtone CO bands, obtained in 2008 May on the Gemini-South 8 m telescope. The 12CO and 13CO bands are well resolved, and we compute synthetic spectra to determine the 12C/13C ratio. We find 12C/13C ≃ 16 ± 3, consistent with the interpretation of the secondary as a red giant which has evolved beyond the first dredge-up phase of evolution.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2010.16329.x