2MASS observations of spectroscopically identified extragalactic C stars

被引：30
作者：
Demers, S
Dallaire, M
Battinelli, P
机构：
[1] Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada
[2] Osserv Astron Roma, I-00136 Rome, Italy
来源：
ASTRONOMICAL JOURNAL | 2002年 / 123卷 / 06期
关键词：
galaxies : individual (Fornax); Magellanic Clouds; stars : carbon; techniques : photometric;
D O I：
10.1086/340692
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We matched spectroscopically identified C stars (from low-resolution objective prism surveys) in the Magellanic Clouds with Two Micron All Sky Survey (2MASS) sources. We confirm that C stars show a large spread in absolute magnitudes, even in the K-s band. We show that the I and K-s magnitude distributions of a population of C stars (in the LMC) have a similar narrow dispersion if the C stars are selected in a well-defined color range. Using magnitude and color criteria, we employ the 2MASS data to identify 26 C stars in the Fornax dwarf spheroidal galaxy. The mean K-s magnitude and the mean bolometric magnitude of C stars are found to be slightly brighter in the LMC and SMC when compared with those of the Fornax dwarf spheroidal galaxy. The difference could be explained by ages and/or abundance differences.
引用
收藏
页码：3428 / 3433
页数：6
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