Luminosities and temperatures of the reddest stars in three LMC clusters.
Luminosities and temperatures of the reddest stars in three LMC clusters.
复制标题
三个 LMC 星团中最红恒星的光度和温度。
DOI：
--
复制
发表时间：
1980
期刊：
影响因子：
--
通讯作者：
J. Cohen
中科院分区：
文献类型：
--
作者：
J. Frogel;S. Persson;J. Cohen
本文介绍了大麦哲伦星云（LMC）星团NGC 1783、1846和1978中12颗最红恒星在1.2-2.2 μ m波段的红外观测结果。其中七颗恒星是碳星，在大麦哲伦星云的一般视野中，它们在光度上与碳星无法区分。测热星等和温度是从红外数据中得出的。碳星的平均辐射热星等为-4.9等，比先前公布的数值暗了约2等，但仍足以证明这些恒星是渐近巨星分支星。这些星团中最明亮的M型恒星比富含金属的球状星团的巨大分支更温暖，可能更明亮，这与霍奇基于UBV测光的结果一致。M型星的位置可能会给最近的巨分支模型计算带来一些问题。主题标题：星团：开放星系：麦哲伦星云-恒星：晚型恒星：光度
Infrared observations in the 1.2-2.2 ¿¿m region are presented for 12 of the reddest stars in the Large Magellanic Cloud (LMC) clusters NGC 1783,1846, and 1978. Seven of the stars, which are carbon stars, are photometrically indistinguishable from carbon stars in the general field of the LMC. Bolometric magnitudes and temperatures are derived from the infrared data. The average bolometric magnitude of the carbon stars is —4.9, which is about two magnitudes fainter than previously published values, but still high enough to require that these stars are asymptotic giant branch stars. The most luminous M-type stars in these clusters are warmer and perhaps more luminous than the giant branches of metal-rich Galactic globular clusters, in agreement with Hodge’s results based on UBV photometry. The location of the M-type stars may present some problems for recent giant branch model calculations. Subject headings: clusters : open — galaxies : Magellanic Clouds — stars : late-type — stars: luminosities