Mass loss from evolved stars. V - Observations of the (C-12)O and (C-13)O J = 1-0 lines in Mira variables and carbon stars

Astronomy and Astrophysics – Astrophysics

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Astronomical Spectroscopy, Carbon Stars, Mira Variables, Stellar Composition, Stellar Envelopes, Stellar Mass Ejection, Variable Stars, Carbon Monoxide, Carbon 12, Carbon 13, Emission Spectra, Line Spectra

Scientific paper

Emission in the 13CO J = 1-0 line of CO was detected from 15 circumstellar envelopes (three tentatively) produced by mass loss from evolved stars. The intensity ratios for the 13CO:12CO lines are on the average higher for stars with [O] > [C] than for carbon stars. While individual values are not well determined, the observations suggest that Mira stars have 12C/13C in the range 5 - 20, while for carbon stars the range is 30 - 100.

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