Discovery of extreme carbon stars in the large magellanic cloud

R. A. Gruendl, Y. H. Chu, J. P. Seale, M. Matsuura, A. K. Speck, G. C. Sloan, L. W. Looney

Research output: Contribution to journalArticlepeer-review

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) x 103 L and preliminary model fitting gives mass-loss rates between 4 x 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.

Original languageEnglish (US)
Pages (from-to)L9-L12
JournalAstrophysical Journal
Volume688
Issue number1 PART 2
DOIs
StatePublished - 2008

Keywords

  • Infrared: stars
  • Magellanic Clouds
  • Stars: AGB and post-AGB
  • Stars: carbon

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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