Introduction to Galactic Chemical Evolution

8th European Summer School on Experimental Nuclear Astrophysics (Santa Tecla School)

物理学;天文学

Matteucci, Francesca^1

Department of Physics, Trieste University, Via G.B. Tiepolo 11, Trieste

34131, Italy^1

关键词: Chemical evolution;    Galactic chemical evolutions;    Galaxy formations;    Initial conditions;    Interstellar mediums;    Observational data;    Stellar nucleosynthesis;    Time evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/703/1/012004/pdf
DOI  :  10.1088/1742-6596/703/1/012004

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

In this lecture I will introduce the concept of galactic chemical evolution, namely the study of how and where the chemical elements formed and how they were distributed in the stars and gas in galaxies. The main ingredients to build models of galactic chemical evolution will be described. They include: initial conditions, star formation history, stellar nucleosynthesis and gas flows in and out of galaxies. Then some simple analytical models and their solutions will be discussed together with the main criticisms associated to them. The yield per stellar generation will be defined and the hypothesis of instantaneous recycling approximation will be critically discussed. Detailed numerical models of chemical evolution of galaxies of different morphological type, able to follow the time evolution of the abundances of single elements, will be discussed and their predictions will be compared to observational data. The comparisons will include stellar abundances as well as interstellar medium ones, measured in galaxies. I will show how, from these comparisons, one can derive important constraints on stellar nucleosynthesis and galaxy formation mechanisms. Most of the concepts described in this lecture can be found in the monograph by Matteucci (2012).