SIMBAD references

2000A&A...359..586S - Astronomy and Astrophysics, volume 359, 586-596 (2000/7-2)

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


Abstract (from CDS):

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. (1986ApJS...62..373L) 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.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: carbon - stars: circumstellar matter - stars: late-type

Simbad objects: 22

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