Dust formation in winds of long-period variables IV. Atmospheric dynamics and mass loss
- Author(s)
- Susanne Höfner, Ernst Dorfi
- Abstract
We have calculated radiation-hydrodynamical models of the atmosphere and circumstellar dust shell of C-rich long-period variables which include a detailed description of the dust formation process. We discuss the time-dependent behaviour of the circumstellar envelope (e.g. multiperiodicity) and its relevance for observational properties like near-IR light curves and investigate the time-averaged mass loss characteristics of a sample of models satisfying radius-luminosity-mass and period-luminosity relations. The results can be summarized as follows: The dependence of the mass loss rate on stellar parameters predicts a strong increase of mass loss as stars evolve along the AGB. The models presented agree reasonably well with mean mass loss-period relations deduced from observations of Mira stars and the observed scatter of mass loss rates for a given period can be understood in terms of pulsation amplitude or non-linearities of the wind mechanism. The wind velocities show a good correlation with the quantity (?d/?g) L*/M* which characterizes the strength of radiation pressure on dust relative to gravitation.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Uppsala University
- Journal
- Astronomy & Astrophysics
- Volume
- 319
- Pages
- 648-654
- No. of pages
- 7
- ISSN
- 0004-6361
- Publication date
- 1997
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/08a0cb6f-eada-4bc0-bc54-a0ca70a618d3