Introduction to Asymptotic Giant Branch Stars

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

物理学;天文学

El Eid, Mounib F.^1

American University of Beirut, Department of Physics, P.O. Box 11-0236, Riad El-Solh, Beirut, Lebanon^1

关键词: AGB stars;    Asymptotic giant branch stars;    Evolutionary phasis;    Heavy elements;    Neutron-capture process;    Radioactive decay;    S-process;    Theoretical modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/703/1/012005/pdf
DOI  :  10.1088/1742-6596/703/1/012005

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

A brief introduction on the main characteristics of the asymptotic giant branch stars (briefly: AGB) is presented. We describe a link to observations and outline basic features of theoretical modeling of these important evolutionary phases of stars. The most important aspects of the AGB stars is not only because they are the progenitors of white dwarfs, but also they represent the site of almost half of the heavy element formation beyond iron in the galaxy. These elements and their isotopes are produced by the s-process nucleosynthesis, which is a neutron capture process competing with the β-radioactive decay. The neutron source is mainly due to the reaction13C(α,n)16O reaction. It is still a challenging problem to obtain the right amount of13C that can lead to s-process abundances compatible with observation. Some ideas are presented in this context.