Journal Article

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

Ya. V. Pavlenko, Charles E. Woodward, M. T. Rushton, B. Kaminsky and A. Evans

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 404, issue 1, pages 206-211
Published in print May 2010 | ISSN: 0035-8711
Published online April 2010 | e-ISSN: 1365-2966 | DOI:
First overtone CO bands in the giant component of RS Ophiuchi: the 12C/13C ratio in 2008

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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.

Keywords: stars: abundances; binaries: symbiotic; stars: individual: RS Oph; novae, cataclysmic variables

Journal Article.  4406 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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