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Evolution and chemical yields of AGB stars: effects of low-temperature opacities
Open accessAbstract
The studies focused on the thermally pulsing asymptotic giant branch phase experienced by low- and intermediate-mass stars are extremely important in many astrophysical contexts. In particular, a detailed computation of their chemical yields is essential for several issues, ranging from the chemical evolution of galaxies to the mechanisms behind the formation of globular clusters. Among all the uncertainties affecting the theoretical modelling of this phase, and described in the literature, it remains to be fully clarified which results are severely affected by the use of inadequate low-temperature opacities, which are in most cases calculated on the basis of the original chemical composition of the stars, and do not consider the changes in the surface chemistry due to the occurrence of the third dredge-up and hot-bottom burning. Our investigation is aimed at investigating this point. By means of full evolutionary models including a new set of molecular opacities computed specifically with the æsopus tool, we highlight which stellar models, among those present in the literature, need a substantial revision, mainly in relation to the predicted chemical yields. The interplay among convection, hot-bottom burning and the low-temperature opacity treatment is also discussed.
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AGB models with HBB can deplete C and O (while producing N), which causes changes to the stellar structure and nucleosynthesis.
“AGB models with HBB can also deplete C and O (while producing N), which causes changes to the stellar structure and nucleosynthesis (Weiss & Ferguson 2009; Ventura & Marigo 2009, 2010; Fishlock et al. 2014).”
From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Ventura & Marigo 2009
Section 3 (p. 4) identifies carbon depletion as a signature of HBB and reports that HBB increases nitrogen abundance; Section 4 (p. 5) also reports oxygen depletion in the models. The paper links changes in stellar evolution and chemical yields chiefly to composition-dependent opacity, particularly under mild HBB, rather than establishing that HBB depletion of C and O itself causes the claimed structural changes. Its Conclusions (p. 5) say opacity treatment is not critical for the more massive models with strong HBB. (LLM, conf=0.84)
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Cites
Stellar Models and Yields of Asymptotic Giant Branch Stars
Karakas, A., & Lattanzio, J. C. (2007) · Publications of the Astronomical Society of Australia · doi:10.1071/as07021 · Cited by 312
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The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars
Karakas, A. I., & Lattanzio, J. C. (2014) · Publications of the Astronomical Society of Australia · doi:10.1017/pasa.2014.21 · Cited by 735
“Earlier calculations (e.g., Ventura et al. 2001, 2002; Ventura & D’Antona 2008, 2009; Ventura & Marigo 2009; Ventura & D’Antona 2011) either use older input physics or cover a smaller range in mass and metallicity.”
BackgroundMethod
Metadata
- Authors
- Ventura, P., & Marigo, P.
- Affiliations
- Astronomical Observatory of Rome (IT)
- University of Padua (IT)
- Venue
- Monthly Notices of the Royal Astronomical Society: Letters
- Publisher
- Oxford University Press (OUP)
- Published
- 2009-10-01
- Volume
- 399
- Issue
- 1
- Pages
- L54-L58
- ISSN
- 1745-3925 (ISSN-L)
- 1745-3933
- OpenAlex
- W2085537837
- Cited by
- 38
- References
- 1
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2022: 3 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 4 · 2015: 5 · 2014: 5 · 2013: 4 · 2012: 1
- FWCI
- 1.18
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Monthly Notices of the Royal Astronomical Society Letters (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Padua Research Archive (University of Padova) (submittedVersion, other-oa)
- HighWire Press Open Archive (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Gamma-ray bursts and supernovae
- Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
- Keywords
- asymptotic giant branch stars, thermally pulsing AGB, reaction yield, third dredge-up, hot bottom burning, surface chemistry, stellar evolution models, convection, globular cluster formation, galactic chemical evolution, molecular opacities
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