Multiple circumstellar shells and radiation pressure on grains in the outflows from late-type giants

Details Multiple circumstellar shells and radiation pressure on grains in the outflows from late-type giants Multiple circumstellar shells and radiation pressure on grains in the outflows from late-type giants

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282..200j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 1, 1984, p. 200-205. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

71

Late Stars, Red Giant Stars, Stellar Envelopes, Stellar Mass Ejection, Flow Velocity, Interstellar Matter, Radiation Pressure, Stellar Models

Scientific paper

It is pointed out that mass loss from red giants and supergiants is sometimes as high as 0.0001 solar mass per year. This mass loss represents a major source of new interstellar matter. The present investigation is concerned with the phenomena involved in stellar mass loss, taking into account a comparison of currently available observations with plausible models. The case of the extended circumstellar envelope around IRC +10216 is considered. In observations about mass loss from circumstellar shells, it is sometimes found that the P Cygni profiles are split into two or more sharp, distinct components. The question is considered whether such narrow separate components can be understood in terms of the radiation pressure model. A grain growth model is discussed along with outflow velocity, radiation pressure, and mass loss rates. The models are compared with observations from Alpha Orionis, Mira, and IRC +10216. It is concluded that a hybrid model for the mass loss from some late-type stars seems appropriate. Under certain conditions, outflow speeds of 10 to 20 km/s can be understood.

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