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Abstract: In order to explain the lack of carbon stars in the Galactic bulge, we havemade a detailed study of thermal pulse - asymptotic giant branch stars by usinga population synthesis code. The effects of the oxygen overabundance and themass loss rate on the ratio of the number of carbon stars to that of oxygenstars in the Galactic bulge are discussed. We find that the oxygenoverabundance which is about twice as large as that in the solar neighbourhoodclose to the present observations is insufficient to explain the rareness ofcarbon stars in the bulge. We suggest that the large mass loss rate may serveas a controlling factor in the ratio of the number of carbon stars to that ofoxygen stars.



Autor: Zhu Chunhua, Lv Guoliang, Wang Zhaojun, Zhang Jun

Fuente: https://arxiv.org/







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