First Overtone CO Bands in the Giant Component of RS Ophiuchi: the 12C/13C Ratio in 2008

Details First Overtone CO Bands in the Giant Component of RS Ophiuchi: the 12C/13C Ratio in 2008 First Overtone CO Bands in the Giant Component of RS Ophiuchi: the 12C/13C Ratio in 2008

2010-01-11

arxiv.org/abs/1001.1668v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, to appear in MNRAS

Scientific paper

We present an analysis of a high resolution (R = 40000) infrared spectrum of the RS Oph secondary around the first overtone CO bands, obtained in 2008 May on the Gemini South 8 m. 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 red giant which has evolved beyond the first drege-up phase of evolution.

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