Carbon isotopic abundance ratios in S-type stars

Details Carbon isotopic abundance ratios in S-type stars Carbon isotopic abundance ratios in S-type stars

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...535a.101w&link_type=abstract

Astronomy & Astrophysics, Volume 535, id.A101

Astronomy and Astrophysics

Astrophysics

Stars: Agb And Post-Agb, Stars: Abundances

Scientific paper

We have used the IRAM 30 m telescope on Pico de Veleta to observe 11 S-type stars in the J = 1-0 and J = 2-1 transitions of both 12C16O and 13C16O in order to derive the 12CO/13CO ratio in their circumstellar envelopes. Detections of high signal to noise were achieved for 7 stars. A mean isotope ratio of 35.3 ± 6.2 was found. This ratio fits between the ratio for late M stars of about 12 ± 3 and that of carbon stars of 58 ± 17. Hence, we confirm the often proposed evolutionary sequence from late M through type S to carbon stars. Mass loss rates of 5 × 10-8 to 3 × 10-6 M&sun; y-1 are derived from the present CO data using a simple uniform outflow model with line-dependent opacities, in very good agreement with previous mass-loss estimates.
Based on observations carried out with the IRAM 30 m radio-telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).

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