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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents



ID: 12276.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
The hydrodynamical structure of circumstellar envelopes around low mass-loss rate, low outflow velocity AGB stars
Authors:Winters, J. M.; Le Bertre, T.; Nyman, L. A.; Omont, A.; Jeong, K. S.
Language:English
Date of Publication (YYYY-MM-DD):2002-06
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Volume:388
Issue / Number:2
Start Page:609
End Page:614
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Recent hydrodynamical models (Winters et al. 2000b) allow the existence of pulsating, large velocity amplitude Asymptotic Giant Branch (AGB) stars with tenuous dusty circumstellar shells, which produce low mass-loss rates and simultaneously low wind velocities. The Semi-regular long-period variable L-2 Pup shows a broad SiO maser feature at 86 GHz (v = 1, J = 2-1), indicating an outward velocity of the material close to the stellar photosphere of at least 10 km s(-1), and narrow CO (J = 2-1) and (1-0) line profiles indicating an outflow velocity of the material in the circumstellar shell of only about 3 km s(- 1). This can be explained in terms of our hydrodynamical models which provide large velocities in the shocked stellar atmosphere and low velocities of the circumstellar outflow.
Free Keywords:hydrodynamics; stars : mass-loss; stars : AGB and post-AGB; stars : individual : L-2 Pup; stars : winds; outflows; radio lines : stars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany; Max Planck Inst Radioastron, D-53121 Bonn, Germany; Observ Paris, DEMIRM, UMR 8540, F-75014 Paris, France; European So Observ, Swedish ESO Submillimetre Telescope, Santiago 19, Chile; CNRS, Inst Astrophys Paris, F-75014 Paris, France
Identifiers:ISI:000176100000031
ISSN:0004-6361
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