Three-component modeling of C-rich AGB star winds. II. The effects of drift in long-period variables

Details Three-component modeling of C-rich AGB star winds. II. The effects of drift in long-period variables Three-component modeling of C-rich AGB star winds. II. The effects of drift in long-period variables

2003-04-15

arxiv.org/abs/astro-ph/0304278v1

Astron.Astrophys. 404 (2003) 789

Astronomy and Astrophysics

Astrophysics

19 pages, 8 figures, accepted by A&A

Scientific paper

10.1051/0004-6361:20030515

We present three-component wind models for carbon rich pulsating AGB stars. In particular we study the effects of drift in models of long-period variables, meaning that the dust is allowed to move relative to the gas (drift models). In addition we investigate the importance of the degree of variability of the wind structures. The wind model contains separate conservation laws for each of the three components of gas, dust and the radiation field. We use two different representations for the gas opacity, resulting in models with different gas densities in the wind. The effects which we investigate here are important for the understanding of the wind mechanism and mass loss of AGB stars. This study is hereby a necessary step towards more reliable interpretations of observations. We find that the effects of drift generally are significant. They cannot be predicted from models calculated without drift. Moreover, the non-drift models showing the lowest mass loss rates, outflow velocities, and the smallest variability in the degree of condensation do not form drift model winds. The wind formation in drift models is, except for a few cases, generally less efficient and the mass loss consequently lower than in the corresponding non-drift models. The effects of drift are generally larger in the more realistic models using that representation of the gas opacity which results in lower densities. The outflow properties of these models are also -- for all cases we have studied -- sensitive to the period of the stellar pulsations. A check of the mass loss rates against a (recent) fit formula shows systematically lower values, in particular in the more realistic models with a low density. The fit is in its current form inapplicable to the new models presented here.

Affiliated with

Also associated with

No associations

Rating

Three-component modeling of C-rich AGB star winds. II. The effects of drift in long-period variables does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Three-component modeling of C-rich AGB star winds. II. The effects of drift in long-period variables, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Three-component modeling of C-rich AGB star winds. II. The effects of drift in long-period variables will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-477620