CO (J=1-0) observations of bright carbon stars.
Abstract
The authors have surveyed a sample of bright N-type stars, with recent estimates of chemical composition, in the CO(J = 1-0) line. Almost all stars were detected. The mass loss rate is well correlated with a far-IR excess measure, and the gas-to-dust mass ratio, estimated to be 350±200, seems relatively constant for this sample of stars. The mass loss rate appears to be dependent on the effective temperature, the carbon excess, and the 12C/13C-ratio of the central star. In particular, the peculiar 13C-rich stars have comparatively low mass loss rates. A weak dependence of gas expansion velocity of the circumstellar envelope on the carbon excess may exist.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1987
- Bibcode:
- 1987A&A...183L..13O
- Keywords:
-
- Carbon Monoxide;
- Carbon Stars;
- Far Infrared Radiation;
- Stellar Luminosity;
- Stellar Mass Ejection;
- Stellar Spectrophotometry;
- Mass Flow Rate;
- Stellar Composition;
- Stellar Envelopes;
- Astrophysics