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HIGH-RESOLUTION CO OBSERVATIONS OF WEAK G-BAND STARS

CHRISTOPHER SNEDEN and CATHERINE A. PILACHOWSKI
Publications of the Astronomical Society of the Pacific
Vol. 96, No. 575 (January 1984), pp. 38-43
Stable URL: http://www.jstor.org/stable/40678282
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
HIGH-RESOLUTION CO OBSERVATIONS OF WEAK G-BAND STARS
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Abstract

High-resolution spectra of the 2µ first-overtone CO bands in the weak G-band giants HR 6766 and 37 Com have been obtained. Synthetic spectra have been computed to obtain carbon abundances and carbon isotope ratios. There is excellent agreement between the carbon abundances derived from our CO data and those determined using features of the CH G-band. Therefore no large enrichment of helium in these stellar envelopes is likely. The ¹⁳CO features in 37 Com are strong; a carbon isotope ratio as low as 2 is indicated for this star.

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