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【学术报告】1月6日(周五)上午10点,天文楼402会议室

发布时间:2017-01-03 10:52来源:未知 责任编辑:曲立安

报告题目:New PARSEC database of alpha-enhanced stellar evolutionary tracks and isochrones

报 告 人:符晓婷 (意大利国际高等研究院)

报告时间:2017年01月06日 10时00分

报告地点:天文楼402会议室

摘要: 
  Precise studies on the Galactic bulge and multiple populations of
globular cluster require stellar model with alpha enhancement and
various helium contents. It is also important for extra- Galactic study
to have  alpha enhanced population synthesis. For this purpose we expand PARSEC model from solar-scaled composition to alpha enhanced mixtures. The new model is calibrated with globular cluster 47Tuc (NGC104).  We then apply the calibration and alpha enhanced mixture based on the two 47Tuc populations ( [alpha/Fe] ∼0.4 and 0.2) to other metallicities. The new model  closes the gap between the observation and model prediction on the RGB bump. Besides the alpha enhanced metal mixture in 47Tuc, we also calculate evolutionary tracks based on metal mixtures from ATLAS9 APOGEE atmosphere model.
 

学术报告