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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
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40678282
Page Count: 6
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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 ¹CO features in 37 Com are strong; a carbon isotope ratio as low as 2 is indicated for this star.
Publications of the Astronomical Society of the Pacific © 1984 The University of Chicago Press