The lack of carbon stars in the Galactic bulge
Zhu Chun-Hua;Lv Guo-Liang;Wang Zhao-Jun;Zhang Jun
【期刊名称】《中国物理：英文版》 【年(卷),期】2008(017)004
【摘要】In order to explain the lack of carbon stars in the Galactic bulge, we have made a detailed study of thermal pulseasymptotic giant branch (TP-AGB) stars by using a population synthesis code. The effects of the oxygen overabundance and the mass loss rate on the ratio of the number of carbon stars to that of oxygen stars in the Galactic bulge are discussed. We find that the oxygen overabundance which is about twice as large as that in the solar neighbourhood (close to the present observations) is insufficient to explain the rareness of carbon stars in the bulge. We suggest that the large mass loss rate may serve as a controlling factor in the ratio of the number of carbon stars to that of oxygen stars.
【总页数】8页(1518-1525)
【关键词】carbon stars, thermal pulse-asymptotic giant branch (TP-AGB), population synthesis,Galactic bulge
【作者】Zhu Chun-Hua;Lv Guo-Liang;Wang Zhao-Jun;Zhang Jun
【作者单位】School of Science, Xi'an Jiaotong University, Xi'an 710049, China;Department of Physics, Xinjiang University, Wulumuqi 830046, China;Department of Physics, Xinjiang University, Wulumuqi 830046,
The lack of carbon stars in the Galactic bulge
