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Miras and Mass Loss in the Local Group

Published online by Cambridge University Press:  25 May 2016

Albert A. Zijlstra  and
Timothy R. Bedding
Albert A. Zijlstra
Affiliation:
UMIST, Department of Physics, PO Box 88, Manchester M60 1QD, UK
Timothy R. Bedding
Affiliation:
School of Physics, University of Sydney, Sydney 2006, Australia

Abstract

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Evolved AGB stars pass through a phase of heavy mass loss during which they become optically obscured. We describe an observational program to find and study such stars in the Magellanic Clouds. Many of the obscured stars are found to be luminous carbon stars, a population previously missing. We discuss the Mira PL relation, valid before the onset of the heaviest mass loss. We find that a number of semi-regulars fit this relation, based on Hipparcos parallaxes. No evidence is seen for a Z-dependence, giving a powerful potential distance indicator. We derive a distance modulus to the LMC of m − M = 18.63 ± 0.09 as well as a bright calibration for the Horizontal Branch in globular clusters.

Type
Part 3: Star Formation Processes and Chemical Evolution
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 348 - 355
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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