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From wind to superwind - The evolution of mass-loss rates for Mira modelsDynamical atmosphere models were calculated for a large grid of variables with Mira-like properties satisfying the Iben radius-luminosity-mass relationship for evolving AGB stars. Their masses ranged from 0.7 to 2.4 solar masses, and their periods from 150 to 800 days. All were fundamental-mode pulsators, had solar metallicity, and included effects of dust. The mass-loss rate increases as an approximately exponential function of time, reaching 0.00001-0.0001 solar masses/yr. Further evolution is dominated by the powerful wind, which strips the star's envelope from the core. This 'superwind', a remarkably robust effect, occurs for all initial stellar masses and all modeling parameters that have been tested. Models with very low metallicity also show the effect, but at higher luminosities, which has intriguing implications for the number of supernovae in early low-metallicity populations and for the chemical evolution of galaxies.
Document ID
19910059777
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bowen, G. H.
(Iowa State Univ. of Science and Technology Ames, IA, United States)
Willson, L. A.
(Iowa State University of Science and Technology, Ames, United States)
Date Acquired
August 15, 2013
Publication Date
July 10, 1991
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 375
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A44400
Funding Number(s)
CONTRACT_GRANT: NAGW-1364
Distribution Limits
Public
Copyright
Other

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