Cosmic chemistry from AGB stars and its dependence on the initial stellar mass

M. Lugaro, A. I. Karakas, D. A. García-Hernández, L. R. Nittler, LUNA Collaboration

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

Abstract

Asymptotic giant branch (AGB) stars synthetise a variety of elements in their deep hot layers, mix them to the stellar surface, and shed them into their surrounding by stellar winds. Through this series of processes (nucleosynthesis, mixing, and winds) they contribute to the chemical evolution of stellar groups and galaxies. Specifically, they significantly produce a number of light elements (such as C an N), as well as roughly half of the cosmic abundances of the elements from Sr to Bi via slow neutron captures (the s process). This peculiar nucleosynthesis is strictly dependent on the initial stellar mass and the metallicity. In particular, as the stellar mass increases towards the AGB-Supernova transition limit the signature of H burning becomes predominant with respect to that of He burning and neutron captures. We discuss the origin of these differences and their implications on observational constraints from spectroscopic observations of AGB stars and meteoritic stardust.

Original languageEnglish
Title of host publicationMemorie della Societa Astronomica Italiana - Journal of the Italian Astronomical Society
Subtitle of host publication2017 AGB-Supernovae Mass Transition; Monte Porzio Catone; Italy; 27 March 2017 through 31 March 2017
EditorsAmanda Karakas, Paolo Ventura, Flavia Dell’Agli, Marcella Di Criscienzo
Place of PublicationTrieste Italy
Pages237-243
Number of pages7
Volume88
Edition3
Publication statusPublished - 2017
Event2017 AGB-Supernovae Mass Transition - Monte Porzio Catone, Italy
Duration: 27 Mar 201731 Mar 2017

Publication series

NameMemorie della Società Astronomica Italiana
PublisherSocietà Astronomica Italiana
ISSN (Print)1824-016X

Conference

Conference2017 AGB-Supernovae Mass Transition
CountryItaly
CityMonte Porzio Catone
Period27/03/1731/03/17

Keywords

  • Stars: abundances
  • Stars: AGB and post-AGB

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