Heavy-element yields and abundances of asymptotic giant branch models with a Small Magellanic Cloud metallicity

Amanda I. Karakas, Maria Lugaro, Marília Carlos, Borbála Cseh, Devika Kamath, D. A. García-Hernández

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We present new theoretical stellar yields and surface abundances for asymptotic giant branch (AGB) models with a metallicity appropriate for stars in the Small Magellanic Cloud (SMC, Z = 0.0028, [Fe/H] ≈ -0.7). New evolutionary sequences and post-processing nucleosynthesis results are presented for initial masses between 1 and 7 M, where the 7 M is a super-AGB star with an O-Ne core. Models above 1.15 M become carbon rich during the AGB, and hot bottom burning begins in models M ≥ 3.75M. We present stellar surface abundances as a function of thermal pulse number for elements between C to Bi and for a selection of isotopic ratios for elements up to Fe and Ni (e.g. 12C/13C), which can be compared to observations. The integrated stellar yields are presented for each model in the grid for hydrogen, helium, and all stable elements from C to Bi.We present evolutionary sequences of intermediate-mass models between 4 and 7 M and nucleosynthesis results for three masses (M = 3.75, 5, and 7M) including s-process elements for two widely used AGB mass-loss prescriptions.We discuss our newmodels in the context of evolvedAGB and post-AGB stars in the SMCs, barium stars in our Galaxy, the composition of Galactic globular clusters including Mg isotopes with a similar metallicity to our models, and to pre-solar grains which may have an origin in metal-poor AGB stars.

LanguageEnglish
Pages421-437
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume477
Issue number1
DOIs
Publication statusPublished - 11 Jun 2018

Fingerprint

Magellanic clouds
heavy elements
metallicity
asymptotic giant branch stars
nuclear fusion
stars
barium
globular clusters
isotopic ratio
helium
isotopes
grids
hydrogen
isotope
galaxies
carbon
metal
pulses
metals

Keywords

  • nuclear reactions, nucleosynthesis, abundances
  • stars: AGB and post-AGB
  • ISM: abundances
  • galaxies: abundances
  • Magellanic Clouds

Cite this

Karakas, Amanda I. ; Lugaro, Maria ; Carlos, Marília ; Cseh, Borbála ; Kamath, Devika ; García-Hernández, D. A. / Heavy-element yields and abundances of asymptotic giant branch models with a Small Magellanic Cloud metallicity. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 477, No. 1. pp. 421-437.
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Heavy-element yields and abundances of asymptotic giant branch models with a Small Magellanic Cloud metallicity. / Karakas, Amanda I.; Lugaro, Maria; Carlos, Marília; Cseh, Borbála; Kamath, Devika; García-Hernández, D. A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 477, No. 1, 11.06.2018, p. 421-437.

Research output: Contribution to journalArticleResearchpeer-review

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KW - stars: AGB and post-AGB

KW - ISM: abundances

KW - galaxies: abundances

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