Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/5399
Title: [O/Fe] Estimates for Carbon-enhanced Metal-poor Stars from Near-infrared Spectroscopy
Authors: Kennedy, C. R
Sivarani, T
Beers, T. C
Lee, Y. S
Placco, V. M
Rossi, S
Christlieb, N
Herwig, F
Plez, B
Keywords: Galaxy: halo;Stars: abundances;Stars: agb and post-agb;Stars: population II;Techniques: spectroscopic
Issue Date: Mar-2011
Publisher: IOP Publishing
Citation: The Astronomical Journal, Vol. 141, No. 3, 102
Abstract: 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.
Description: Open Access
URI: http://hdl.handle.net/2248/5399
???metadata.dc.rights???: © IOP Publishing
???metadata.dc.relation.uri???: http://dx.doi.org/10.1088/0004-6256/141/3/102
Appears in Collections:IIAP Publications

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