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恒星结构与演化(2019.2-2019.6)仙林校区天文楼521房间：xlluo@nju.edu.c新炼•组成更大尺度天体的基本单元•宇宙、星系化学演化中元素的合成•结构形成过程中的feedback作用•研究大尺度，遥远天体的探针——星光2第一章恒星的基本性质§1.1恒星的基本物理量及其测量§1.2§1.3星族§1.4恒星演化的基本方程DonaldD.Clayton,PrinciplesofStellarEvolutionandNucleosynthesis,page1–74.Purposeofthischapter:providethenecessarybackground3天文文献数据10.ChineseVirtualObservatory:4什么是恒星？恒星：.。Astarcanbedefinedasabodythatsatisfiestwoconditions:(a)itis;(b)it..Thewholelifeofstarisalifetofightagainst.5Howtodescribestars?Observableproperties:•Theinternalpropertiesofstarscanbeprimarilydescribedbyjustafewparameters:Mass(M),Radius(R),Temperature(T)andchemicalcomposition(thefractionsofdifferentelements,suchasH,He,insideastar),andarelatedconceptluminosity(L).•Severalimportantexternalparameters:suchasdistanceandtheirmotionsinspace.6ObservationalEvidencesco