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Carbon Stars in the Sagittarius Dwarf Galaxy

Published online by Cambridge University Press:  25 May 2016

Patricia Whitelock ,
John Menzies ,
Mike Irwin  and
Michael Feast
Patricia Whitelock
Affiliation:
SAAO, P O Box 9, Observatory, 7935, South Africa
John Menzies
Affiliation:
SAAO, P O Box 9, Observatory, 7935, South Africa
Mike Irwin
Affiliation:
RGO, Madingley Road, Cambridge CB3 OEZ, UK
Michael Feast
Affiliation:
UCT, Rondebosch, 7700, South Africa

Abstract

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Coordinates are listed for 26 carbon stars which are radial velocity members of the Sagittarius Dwarf Galaxy (SDG). Their near-infrared properties indicate that most are on an extended Asymptotic Giant Branch (AGB), and the total number of such stars in the SDG is estimated at about 100. At least one-third of the C stars studied are large amplitude, i.e. Mira, variables; these are the first Miras to be found in a dSph galaxy. Surprisingly, the most luminous C star is not a Mira, but a low amplitude variable.

A comparison of the properties of C stars in the Bulge and in the SDG indicates that the two groups cannot be drawn from the same population. It is therefore highly unlikely that the Bulge C stars are, contrary to previous suggestions, related in any way to the SDG.

Type
Part 2: The Database
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 136 - 143
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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