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CARBON-RICH DUST PRODUCTION IN METAL-POOR GALAXIES IN THE LOCAL GROUP
Open accessAbstract
We have observed a sample of 19 carbon stars in the Sculptor, Carina, Fornax, and Leo I dwarf spheroidal galaxies with the Infrared Spectrograph on the Spitzer Space Telescope. The spectra show significant quantities of dust around the carbon stars in Sculptor, Fornax, and Leo I, but little in Carina. Previous comparisons of carbon stars with similar pulsation properties in the Galaxy and the Magellanic Clouds revealed no evidence that metallicity affected the production of dust by carbon stars. However, the more metal-poor stars in the current sample appear to be generating less dust. These data extend two known trends to lower metallicities. In more metal-poor samples, the SiC dust emission weakens, while the acetylene absorption strengthens. The bolometric magnitudes and infrared spectral properties of the carbon stars in Fornax are consistent with metallicities more similar to carbon stars in the Magellanic Clouds than in the other dwarf spheroidals in our sample. A study of the carbon budget in these stars reinforces previous considerations that the dredge-up of sufficient quantities of carbon from the stellar cores may trigger the final superwind phase, ending a star's lifetime on the asymptotic giant branch.
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Observations of external galaxies such as the LMC, SMC, and dwarf spheroidal galaxies show higher numbers of C stars than in our Galaxy.
“Observations of external galaxies such as the LMC, SMC, and dwarf spheroidal galaxies show higher numbers of Cstars than in our Galaxy (e.g., Zijlstra et al. 2006; Sloan et al. 2008, 2012)”
From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Sloan et al. 2012
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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
“Observations of external galaxies such as the LMC, SMC, and dwarf spheroidal galaxies show higher numbers of C-stars than in our Galaxy (e.g., Zijlstra et al. 2006; Sloan et al. 2008, 2012), which is evidence that it is easier to obtain TDU at lower metallicities, for a given mass.”
Background
Metadata
- Authors
- Sloan, G. C., Matsuura, M., Lagadec, E., van Loon, J. T., Kraemer, K. E., McDonald, I., Groenewegen, M. A. T., Wood, P. R., Bernard-Salas, J., & Zijlstra, A. A.
- Affiliations
- Cornell University (US)
- University College London (GB)
- European Southern Observatory (DE)
- Keele University (GB)
- Boston College (US)
- University of Manchester (GB)
- Royal Observatory of Belgium (BE)
- Australian National University (AU)
- Université Paris-Sud (FR)
- Corresponding author
- Sloan, G. C.
- ORCID
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2012-06-05
- Volume
- 752
- Issue
- 2
- Pages
- 140
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2110097164
- Cited by
- 54
- References
- 0
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 4 · 2023: 3 · 2022: 3 · 2021: 1 · 2020: 1 · 2019: 8 · 2018: 2 · 2017: 5 · 2016: 5 · 2015: 3 · 2014: 5 · 2013: 7 · 2012: 3
- FWCI
- 3.15
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- Open Research Online (The Open University) (acceptedVersion)
- arXiv (Cornell University) (submittedVersion)
- UCL Discovery (University College London) (submittedVersion)
- ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
- ANU Open Research (Australian National University) (submittedVersion)
- Research Explorer (The University of Manchester) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Aeronautics and Space Administration (1257184)
- California Institute of Technology
- Jet Propulsion Laboratory
- Science and Technology Facilities Council (ST/I001425/1, ST/J000035/1, PP/F000057/1, PP/D000955/1, ST/G002355/1, ST/G002827/1)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Keywords
- carbon-rich dust, carbon stars, metallicity, dwarf spheroidal galaxies, Local Group, sculptors, Fornax, Leo I, carina, asymptotic giant branch, dredge-up, superwind, carbon balance
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