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Observational studies of mass loss from AGB stars

Published online by Cambridge University Press:  30 August 2012

Mikako Matsuura
Mikako Matsuura*
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom email: mikako@star.ucl.ac.uk
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Abstract

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It is important to properly describe the mass-loss rate of AGB stars, in order to understand their evolution from the AGB to PN phase. The primary goal of this study is to investigate the influence of metallicity on the mass-loss rate, under well determined luminosities. The luminosity of the star is a crucial parameter for the radiative driven stellar wind. Many efforts have been invested to constrain the AGB mass-loss rate, but most of the previous studies use Galactic objects, which have poorly known distances, thus their luminosities. To overcome this problem, we have studied mass loss from AGB stars in the Galaxies of the Local Group. The distance to the stars have been independently measured, thus AGB stars in these galaxies are ideal for understanding the mass-loss rate. Moreover, these galaxies have a lower metallicity than the Milky Way, providing an ideal target to study the influence of metallicity on the mass-loss rate. We report our analysis of mass loss, using the Spitzer Space Telescope and the Herschel Space Observatory. We will discuss the influence of AGB mass-loss on stellar evolution, and explore AGB and PN contribution to the lifecycle of matter in galaxies.

Keywords

Stars: AGB and post-AGBstars: mass-losssupernovae: generalgalaxies: evolutionMagellanic Cloudsdustextinction
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 80 - 82
Copyright
Copyright © International Astronomical Union 2012

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