Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/185997
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- Title
- Aluminum abundances of multiple stellar generations in the globular cluster NGC 1851
- Related
- Astronomy and astrophysics, Vol. 543, No. A117, (2012), p.1-6
- DOI
- 10.1051/0004-6361/201219277
- Publisher
- EDP Sciences
- Date
- 2012
- Author/Creator
- Carretta, E
- Author/Creator
- D'Orazi, V
- Author/Creator
- Gratton, R. G
- Author/Creator
- Lucatello, S
- Description
- We studied the distribution of aluminum abundances among red giants in the peculiar globular cluster NGC 1851. Aluminum abundances were derived from the strong doublet Al i 8772-8773 Ãmeasured on intermediate-resolution FLAMES spectra of 50 cluster stars acquired under the Gaia-ESO public survey. We coupled these abundances with previously derived abundances of O, Na, and Mg to fully characterize the interplay of the NeNa and MgAl cycles of H-burning at high temperature in the early stellar generation in NGC 1851. The stars in our sample show well-defined correlations between Al, Na and Si; Al is anticorrelated with O and Mg. The average value of the [Al/Fe] ratio steadily increases from the first generation stars to the second generation populations with intermediate and extremely modified composition. We confirm on a larger database the results recently obtained by us: the pattern of abundances of proton-capture elements implies a moderate production of Al in NGC 1851. We find evidence of a statistically significant positive correlation between Al and Ba abundances in the more metal-rich component of red giants in NGC 1851.
- Description
- 6 page(s)
- Subject Keyword
- Globular clusters: general
- Subject Keyword
- Globular clusters: individual
- Subject Keyword
- NGC 1851
- Subject Keyword
- Stars: abundances
- Subject Keyword
- Stars: atmospheres
- Subject Keyword
- Stars: Population II
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Physics and Astronomy
- Identifier
- http://hdl.handle.net/1959.14/185997
- Identifier
- ISSN:0004-6361
- Identifier
- mq-rm-2011008742
- Identifier
- mq_res-ext-2-s2.0-84863609475
- Language
- eng
- Reviewed
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