Metal-rich carbon stars in the Sagittarius dwarf spheroidal galaxy
Open accessAbstract
We present spectroscopic observations from the Spitzer Space Telescope of six carbon-rich asymptotic giant branch (AGB) stars in the Sagittarius dwarf spheroidal galaxy (Sgr dSph) and two foreground Galactic carbon stars. The band strengths of the observed C2H2 and SiC features are very similar to those observed in Galactic AGB stars. The metallicities are estimated from an empirical relation between the acetylene optical depth and the strength of the SiC feature. The metallicities are higher than those of the Large Magellanic Cloud, and close to Galactic values. While the high metallicity could imply an age of around 1 Gyr, for the dusty AGB stars, the pulsation periods suggest ages in excess of 2 or 3 Gyr. We fit the spectra of the observed stars using the dusty radiative transfer model and determine their dust mass-loss rates to be in the range 1.0–3.3 × 10−8 M⊙ yr−1. The two Galactic foreground carbon-rich AGB stars are located at the far side of the solar circle, beyond the Galactic Centre. One of these two stars shows the strongest SiC feature in our present Local Group sample.
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Mass-loss rates in low metallicity C-rich AGB stars in nearby galaxies are of a similar magnitude to AGB stars in our Galaxy.
“Observations showed that mass-loss rates in low metallicity C-rich AGB stars in nearby galaxies are of a similar magnitude to AGB stars in our Galaxy (e.g., Sloan et al. 2009; Lagadec et al. 2009).”
From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Lagadec et al. 2009
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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 · see citing works
“Observations showed that mass-loss rates in low metallicity C-rich AGB stars in nearby galaxies are of a similar magnitude to AGB stars in our Galaxy (e.g., Sloan et al. 2009; Lagadec et al. 2009).”
Background
- Authors
- Lagadec, E., Zijlstra, A. A., Sloan, G. C., Wood, P. R., Matsuura, M., Bernard-Salas, J., Blommaert, J. A. D. L., Cioni, M.-R. L., Feast, M. W., Groenewegen, M. A. T., Hony, S., Menzies, J. W., van Loon, J. T., & Whitelock, P. A.
- Affiliations
- University of Manchester (GB)
- Cornell University (US)
- Australian National University (AU)
- National Astronomical Observatory of Japan (JP)
- KU Leuven (BE)
- University of Hertfordshire (GB)
- University of Cape Town (ZA)
- Royal Observatory of Belgium (BE)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- South African Astronomical Observatory (ZA)
- Corresponding author
- Lagadec, Eric
- ORCID
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 2009-06-11
- Volume
- 396
- Issue
- 1
- Pages
- 598-608
- ISSN
- 0035-8711 (ISSN-L)
- 1365-2966
- OpenAlex
- W2120355413
- Cited by
- 23
- References
- 0
- Citations by year
- 2019: 2 · 2018: 1 · 2017: 1 · 2016: 3 · 2014: 5 · 2013: 2 · 2012: 4
- FWCI
- 1.51
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Monthly Notices of the Royal Astronomical Society (publishedVersion)
- Open Research Online - ORO (The Open University) (acceptedVersion)
- arXiv (Cornell University) (submittedVersion)
- University of Hertfordshire Research Archive (University of Hertfordshire) (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
- California Institute of Technology
- Science and Technology Facilities Council (ST/G002622/1, PP/F000057/1, PP/D000955/1, ST/G002355/1, ST/F003196/1)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Keywords
- carbon-rich stars, Sagittarius dwarf galaxy, asymptotic giant branch stars, metallicity, dust mass-loss rate, stellar ages, pulsation periods, Local Group
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