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Metal-rich carbon stars in the Sagittarius dwarf spheroidal galaxy

Lagadec, Eric; Zijlstra, Albert A; Sloan, G C; Wood, Peter R; Matsuura, M.; Bernard-Salas, J; Blommaert, J A D L; Cioni, M.-R. L; Feast, M.W.; Groenewegen, M A T; Hony, Sacha; Menzies, J. W

Description

We present spectroscopic observations from the Spitzer Space Telescope of six carbon-rich asymptotic giant branch (AGB) stars in the Sagittarius dwarf spheroidal galaxy (Sgr dSph) and two foreground Galactic carbon stars. The band strengths of the observed C 2H 2 and SiC features are very similar to those observed in Galactic AGB stars. The metallicities are estimated from an empirical relation between the acetylene optical depth and the strength of the SiC feature. The metallicities are higher...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
URI: http://hdl.handle.net/1885/33028
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1111/j.1365-2966.2009.14736.x

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