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《中国天文和天体物理学报(英文版)》 2008-01
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Model-Synthesized Rate of Type Ia Supernovae and its Influence on the Chemical Enrichment of the ISM

Wen Guo1 , Feng-Hui Zhang1, Xiang-Cun Meng1 , Zhong-Mu Li1 and Zhan-Wen Han1 ,2 ,2 ,2 1 National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011;2 Graduate School of Chinese Academy of Sciences, Beijing 100049  
Using Hurley’s rapid binary stellar evolution code, we have studied the model- synthesized rate of Type Ia Supernovae (SNe Ia) and its influence on the chemical enrichment of the interstellar medium ejected by stellar populations. We adopt two popular scenarios, i.e., single degenerate scenario (SD) and double degenerate scenario (DD), for the progenitors of SNe Ia to calculate the rates of SNe Ia. Rates calculated in this work agree with that of Hachisu et al. and Han Podsiadlowski, but are different from that usually adopted in chem- ical evolution models of galaxies. We apply the rates of SNe Ia to the chemical enrichment (especially Fe enrichment), then compare the results with previous studies. As known SNe Ia slightly affect the enrichment of C, N, O and Mg elements, while significantly affect the en- richment of Fe. We find that the occurrence and the value of the Fe enrichment in our models are earlier and smaller than that commonly adopted in chemical evolution models. We also study the evolution of [Mg/Fe] ratios, which are almost reciprocals of the Fe enrichment. The study may provide constraints on the free parameters of chemical evolution models of galaxies and evolutionary population synthesis.
【Fund】: Supported by the National Natural Science Foundation of China.
【CateGory Index】: P145.3
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