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

1997/11/12 by G. R. Knapp, Ken Young, K. Young +3 · 6 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Asymptotic giant branch #Physics #Stars #Stellar, planetary, and galactic studies #astro-ph

paper · pdf · doi:10.1086/313111

53 pages, plain TeX, 16 figures in file figs.ps

arxiv created 1997/11/12 · openalex publication_date 1998/07/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

This paper describes observations of a new phenomenon in evolved mass-losing 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.

Citations

• The Boomerang Nebula: The Coldest Region of the Universe?
• Circumstellar shells and mass loss rates: Clues to theevolution of S stars

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