DISCOVERY OF EXTREME CARBON STARS IN THE LARGE MAGELLANIC CLOUD

被引：52

作者：

Gruendl, R. A. ^{[1
]}

Chu, Y. -H ^{[1
]}

Seale, J. P. ^{[1
]}

Matsuura, M. ^{[2
,3
]}

Speck, A. K. ^{[4
]}

Sloan, G. C. ^{[5
]}

Looney, L. W. ^{[1
]}

机构：

[1] Univ Illinois, Dept Astron, Urbana, IL 61801 USA

[2] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[3] UCL, Dept Phys & Astron, London WC1E 6BT, England

[4] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA

[5] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 688卷 / 01期

基金：

美国国家科学基金会;

关键词：

infrared: stars; Magellanic Clouds; stars: AGB and post-AGB; stars: carbon;

D O I：

10.1086/593979

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 10(3) L-circle dot and preliminary model fitting gives mass-loss rates between 4 x 10(-5) and 2 x 10(-4) M-circle dot 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.

引用

页码：L9 / L12

页数：4

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