Discovery of extreme carbon stars in the large Magellanic cloud

Gruendl, R. A., Chu, Y.-H., Seale, J. P., Matsuura, M. ORCID: https://orcid.org/0000-0002-5529-5593, Speck, A. K., Sloan, G. C. and Looney, L. W. 2008. Discovery of extreme carbon stars in the large Magellanic cloud. The Astrophysical Journal 688 (1) , L9-L12. 10.1086/593979

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Abstract

Using Spitzer IRAC and MIPS observations of the Large Magellanic Cloud, we have identified 13 objects that have extremely red mid-IR colors. Follow-up Spitzer IRS observations of seven of these sources reveal varying amounts of SiC and C2H2 absorption as well as the presence of a broad MgS feature in at least two cases, indicating that these are extreme carbon stars. Preliminary estimates find these objects have luminosities of (4-11) × 103L⊙ and preliminary model fitting gives mass-loss rates between 4 × 10-5 and 2 × 10-4 M⊙ yr-1, higher than any known carbon-rich AGB star in the LMC. These spectral and physical properties require careful reconsideration of dust condensation and mass-loss processes for carbon stars in low-metallicity environments....

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Astronomical Society
ISSN:	1538-4357
Date of Acceptance:	26 September 2008
Last Modified:	09 May 2024 15:45
URI:	https://orca.cardiff.ac.uk/id/eprint/168041

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