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Millimetre Observations of Evolved Stars

Published online by Cambridge University Press:  25 April 2016

Jessica M. Chapman
Jessica M. Chapman*
Affiliation:
Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia
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Extract

Radio emission at centimetre and millimetre wavelengths provides a powerful tool for studying the circumstellar envelopes of evolved stars. These include stars on the asymptotic giant branch (AGB), post-AGB stars and a small number of massive M-type supergiant stars. The AGB stars and M-type supergiants are characterised by extremely high mass-loss rates. The mass loss in such an evolved star is driven by radiation pressure acting on grains which form in the outer stellar atmosphere. The grains are accelerated outwards and transfer momentum to the gas through grain–gas collisions. The outflowing dust and gas thus form an expanding circumstellar envelope through which matter flows from the star to the interstellar medium, at a typical velocity of 15 km s−1. For a recent review of circumstellar mass loss see Chapman, Habing & Killeen (1995).

Type
Workshop on Millimetre-wave Astronomy
Information
Publications of the Astronomical Society of Australia , Volume 13 , Issue 2 , May 1996 , pp. 185 - 186
Copyright
Copyright © Astronomical Society of Australia 1996

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