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The role of AGB stars in Galactic and cosmic chemical enrichment

Published online by Cambridge University Press:  30 December 2019

Chiaki Kobayashi Open the ORCID record for Chiaki Kobayashi [Opens in a new window] ,
Christopher J. Haynes  and
Fiorenzo Vincenzo Open the ORCID record for Fiorenzo Vincenzo [Opens in a new window]
Chiaki Kobayashi
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, UK email: [email protected]
Christopher J. Haynes
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, UK email: [email protected]
Fiorenzo Vincenzo
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, UK email: [email protected]
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Abstract

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The role of asymptotic giant branch (AGB) stars in chemical enrichment is significant for producing 12,13C, 14N, F, 25,26Mg, 17O and slow neutron-capture process (s-process) elements. The contribution from super-AGB stars is negligible in classical, one-zone chemical evolution models, but the mass ranges can be constrained through the contribution from electron-capture supernovae and possibly hybrid C+O+Ne white dwarfs, if they explode as Type Iax supernovae. In addition to the recent s-process yields of AGB stars, we include various sites for rapid neutron-capture processes (r-processes) in our chemodynamical simulations of a Milky Way type galaxy. We find that neither electron-capture supernovae or neutrino-driven winds are able to adequately produce heavy neutron-capture elements such as Eu in quantities to match observations. Both neutron-star mergers (NSMs) and magneto-rotational supernovae (MRSNe) are able to produce these elements in sufficient quantities. Using the distribution in [Eu/(Fe, α)] – [Fe/H], we predict that NSMs alone are unable to explain the observed Eu abundances, but may be able to together with MRSNe. In order to discuss the role of long-lifetime sources such as NSMs and AGB stars at the early stages of galaxy formation, it is necessary to use a model that can treat inhomogeneous chemical enrichment, such as in our chemodynamical simulations. In our cosmological, chemodynamical simulations, we succeed in reproducing the observed N/O-O/H relations both for global properties of galaxies and for local inter-stellar medium within galaxies, without rotation of stars. We also predict the evolution of CNO abundances of disk galaxies, from which it will be possible to constrain the star formation histories.

Keywords

binaries: generalGalaxy: abundancesgalaxies: abundanceshydrodynamicsstars: abundancesstars: AGB and post-AGBstars: neutronsupernovae: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 247 - 257
Copyright
© International Astronomical Union 2019 

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