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

2018/03/06 by Amanda Karakas, Amanda I. Karakas, Maria Lugaro +8 · 114 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Asymptotic giant branch #Context (archaeology) #Galaxy #Globular cluster #Large Magellanic Cloud #Metallicity #Nucleosynthesis #Physics #Stars #Stellar evolution #Stellar nucleosynthesis #Stellar, planetary, and galactic studies #astro-ph.SR

paper · pdf · doi:10.1093/mnras/sty625

published in Monthly Notices of the Royal Astronomical Society 477(1), 421-437 (Oxford University Press) · 19 pages, accepted for publication in MNRAS

arxiv created 2018/03/06 · openalex publication_date 2018/03/14 · arxiv updated 2018/03/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

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 1M_\odot and 7M_\odot, where the 7M_\odot is a super-AGB star with an O-Ne core. Models above 1.15M_\odot become carbon rich during the AGB, and hot bottom burning begins in models M ≥ 3.75 M_\odot. 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--7M_\odot and nucleosynthesis results for three masses (M=3.75, 5, 7M_\odot) including s-process elements for two widely used AGB mass-loss prescriptions. We discuss our new models in the context of evolved AGB stars and post-AGB stars in the Small Magellanic Clouds, 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.

Citations

• Elemental abundance survey of the Galactic thick disc
• Lithium and zirconium abundances in massive Galactic O-rich AGB stars
• Multiple Stellar Populations in Three Rich Large Magellanic Cloud Star Clusters
• Evolution of Asymptotic Giant Branch Stars
• Thes‐Process in Rotating Asymptotic Giant Branch Stars
• Reaction rate uncertainties and the operation of the NeNa and MgAl chains during HBB in intermediate-mass AGB stars
• Nucleosynthesis in Asymptotic Giant Branch Stars: Relevance for Galactic Enrichment and Solar System Formation
• Neon and Sulfur Abundances of Planetary Nebulae in the Magellanic Clouds
• Rubidium-Rich Asymptotic Giant Branch Stars
• The Magellanic Zoo: Mid‐InfraredSpitzerSpectroscopy of Evolved Stars and Circumstellar Dust in the Magellanic Clouds
• THE CHEMICAL COMPOSITION OF RED GIANT STARS IN FOUR INTERMEDIATE-AGE CLUSTERS OF THE LARGE MAGELLANIC CLOUD
• Abundances in intermediate-mass AGB stars undergoing third dredge-up and hot-bottom burning
• Mg isotopic ratios in giant stars of the globular cluster NGC 6752
• A single model for the variety of multiple-population formation(s) in globular clusters: a temporal sequence
• The Chemical Composition of the Sun
• Multiple stellar populations in Magellanic Cloud clusters I. An ordinary feature for intermediate age globulars in the LMC?
• The AGB stars of the intermediate-age LMC cluster NGC 1846

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