期刊
ASTRONOMICAL JOURNAL
卷 141, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/141/3/102
关键词
Galaxy: halo; stars: abundances; stars: AGB and post-AGB; stars: Population II; techniques: spectroscopic
资金
- US National Science Foundation
- MSU/JINA
- FAPESP
- CNPq
- Capes
- NSERV
- [AST 07-07776]
- [PHY 02-15783]
- [PHY 08-22648]
We report on oxygen abundances determined from medium-resolution near-infrared spectroscopy for a sample of 57 carbon-enhanced metal-poor (CEMP) stars selected from the Hamburg/ESO Survey. The majority of our program stars exhibit oxygen-to-iron ratios in the range +0.5 < [O/Fe]< + 2.0. The [O/Fe] values for this sample are statistically compared to available high-resolution estimates for known CEMP stars as well as to high-resolution estimates for a set of carbon-normal metal-poor stars. Carbon, nitrogen, and oxygen abundance patterns for a sub-sample of these stars are compared to yield predictions for very metal-poor asymptotic giant branch (AGB) abundances in the recent literature. We find that the majority of our sample exhibit patterns that are consistent with previously studied CEMP stars having s-process-element enhancements and thus have very likely been polluted by carbon- and oxygen-enhanced material transferred from a metal-poor AGB companion.
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