Abstract
A recent survey of the 12CO(J = 1–0) emission from circumstellar envelopes produced by mass loss from evolved giants has been made using the 7 m antenna at Bell Laboratories (Knapp and Morris, 1984, submitted to Astrophysical Journal. A total of 50 stars was detected. Emission in the 13CO J = 1–0 line was searched for in nineteen of the stars with the strongest 12CO emission. The sample contains nine carbon stars, nine stars with [0] > [C] (“oxygen” stars) and one S star, χ Cyg. 13CO emission was detected from twelve stars at a level > 3σ, and from three more stars (IRC+50096, CRL865 and χ Cyg) at the 3σ level.
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© 1985 D. Reidel Publishing Company
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Knapp, G.R., Chang, K.M., Morris, M. (1985). The 13C/12C Isotope Ratio in Circumstellar Envelopes. In: Morris, M., Zuckerman, B. (eds) Mass Loss from Red Giants. Astrophysics and Space Science Library, vol 117. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5428-1_23
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DOI: https://doi.org/10.1007/978-94-009-5428-1_23
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8896-1
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