Multiple Molecular Winds in Evolved Stars. I. A Survey of CO(2-1) and CO(3-2) Emission from 45 Nearby Asymptotic Giant Branch Stars
Abstract
This paper describes observations of a new phenomenon in evolved mass-losing asymptotic giant branch (AGB) stars: the presence of two winds with different expansion velocities. CO(2-1) and CO(3-2) line emission was observed for 45 AGB stars at high velocity resolution and double winds found in 20% of the sample. Highly asymmetric lines were found in six other stars. The data tentatively suggest that double winds occur when the star undergoes a change (pulsational mode, chemical composition) and that the very narrow components represent the onset of a new phase of mass loss.
- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- July 1998
- DOI:
- 10.1086/313111
- arXiv:
- arXiv:astro-ph/9711125
- Bibcode:
- 1998ApJS..117..209K
- Keywords:
-
- RADIO LINES: STARS;
- STARS: AGB AND POST-AGB;
- STARS: MASS LOSS;
- Radio Lines: Stars;
- Stars: AGB and Post-AGB;
- Stars: Mass Loss;
- Astrophysics
- E-Print:
- 53 pages, plain TeX, 16 figures in file figs.ps