The Helium Abundances of ω Centauri
Open accessAbstract
Recent Hubble Space Telescope color magnitude diagrams (CMDs) of ω Centauri, which clearly show three sequences in the region of the main-sequence turnoff together with a double lower main sequence, are explained in terms of three populations having canonical heavy-element abundances ([Fe/H] = -1.7, -1.2, and -0.6), reasonable proportions and ages, but with surprising helium abundances. In particular, the CMD morphology of the second population ([Fe/H] = -1.2) is very well represented with a helium abundance much larger, by Δ Y ~ 0.12, than that of the first ([Fe/H] = -1.7), which may hold the key to an understanding of the double lower main sequence.
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The huge increase in He is one of the reasons why intermediate-mass AGB stars have been implicated in the origin of the multiple populations observed in Galactic GCs.
“This huge increase in He is one of the reasons why intermediate-mass AGB stars have been implicated in the origin of the multiple populations observed in Galactic GCs (D'Antona et al. 2002; Norris 2004; Piotto et al. 2005).”
From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Norris 2004
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Bennett, C. L., Halpern, M., Hinshaw, G., Jarosik, N., Kogut, A., Limon, M., Meyer, S. S., Page, L., Spergel, D. N., Tucker, G. S., et al. (2003) · The Astrophysical Journal Supplement Series · doi:10.1086/377253 · Cited by 4,860 · see citing works
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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
“This huge increase in He is one of the reasons why intermediate-mass AGB stars have been implicated in the origin of the multiple populations observed in Galactic GCs (D’Antona et al. 2002; Norris 2004; Piotto et al. 2005).”
Background
- Authors
- Norris, J. E.
- Affiliations
- Australian National University (AU)
- Corresponding author
- Norris, John E.
- ORCID
- Norris, John E.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2004-08-06
- Volume
- 612
- Issue
- 1
- Pages
- L25-L28
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2079277828
- Cited by
- 326
- References
- 1
- Citations by year
- 2026: 5 · 2025: 7 · 2024: 8 · 2023: 1 · 2022: 6 · 2021: 2 · 2020: 8 · 2019: 10 · 2018: 13 · 2017: 10 · 2016: 14 · 2015: 15 · 2014: 14 · 2013: 15 · 2012: 26
- FWCI
- 12.19
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- ANU Open Research (Australian National University) (submittedVersion)
- 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 › Instrumentation › Astronomy and Astrophysical Research
- Keywords
- Omega Centauri, helium abundance, multiple stellar populations, color-magnitude diagram, main-sequence turnoff, globular clusters, metallicity, stellar ages
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