The 12C/13C-ratio in cool carbon stars

Details The 12C/13C-ratio in cool carbon stars The 12C/13C-ratio in cool carbon stars

2000-05-17

arxiv.org/abs/astro-ph/0005360v1

A&A (2000), 359, 586

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A

Scientific paper

We present observations of circumstellar millimetre-wave 13CO line emission towards a sample of 20 cool carbon stars. Using a detailed radiative transfer model we estimate the circumstellar 12CO/13CO-ratios, which we believe accurately measure the important stellar 12C/13C-ratios. For those optically bright carbon stars where it is possible, our derived 12C/13C-ratios are compared with the photospheric results, obtained with different methods. Our estimates agree well with those of Lambert et al. (1986). It is shown that a straightforward determination of the 12CO/13CO-ratio from observed line intensity ratios is often hampered by optical depth effects, and that a detailed radiative transfer analysis is needed in order to determine reliable isotope ratios.

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