Condensation, growth and acceleration of grains in circumstellar shells - an observer's view

Details Condensation, growth and acceleration of grains in circumstellar shells - an observer's view Condensation, growth and acceleration of grains in circumstellar shells - an observer's view

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...156..199p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 199-206.

Astronomy and Astrophysics

Astrophysics

26

Condensing, Cosmic Dust, Giant Stars, Stellar Envelopes, Supergiant Stars, Radial Distribution, Time Dependence

Scientific paper

An attempt is made to apply the time-dependent homogeneous condensation theory to a number of well documented oxygen-rich red giants and supergiants. It does not lead to a satisfactory match of all the observed properties simultaneously. The purely dynamical part of the theory does not appear to be responsible for this failure. The problem lies in the tight relationship, imposed by the theory, between mass loss rate and grain size. If this is relaxed, the dynamical equations are able to account for the observations. The authors discuss possible improvements to the condensation and growth model, including grain coagulation in macro-turbulent atmospheres. Although these concepts are not easily made quantitative, it is possible to use them in a phenomenological way. When complemented with observational data, the model can then provide new quantitative information, such as star mass and mass loss rate. It also yields other quantities, e.g. grain velocity, whose observation could help in further assessing the validity of the theory.

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