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• W2092402016 abstract "Like two other metal-poor, late-type field stars showing odd abundance ratios suggestive of accreted origin, BD +00°2058A has a substantial apogalactocentric distance, reaches a large maximum height above the Galactic plane, and is a member of a common proper motion system. To examine whether such wide pairs might have a common origin in accreted subsystems, we present detailed abundances in BD +00°2058A derived from high signal-to-noise, high-resolution optical spectroscopy. Using spectroscopically derived parameters, we find [Fe/H] = -1.16±0.07, a factor of 2-4 larger than previous (but less direct) estimates. We find the α-element, iron-peak, and n-capture abundances to be unremarkable compared with other field stars of similar [Fe/H]. The derived Li abundance, log N(Li) = 2.53, is large compared with otherwise similar stars; the normal n-capture abundances and upper limits to 6Li/7Li provide no evidence of Li enrichment from Li-rich asymptotic giant branch star material or spallation. Interestingly, the [C/Fe] and [Na/Fe] ratios appear to be ~0.3 dex lower and higher, respectively, than otherwise similar stars. This might point to Li enrichment by contaminating material having undergone cool bottom processing, but the lack of radial velocity variations provides no evidence of a close companion. Comparison with theoretical isochrones suggests a distance of 150 pc, which is in better agreement with two previous studies' estimates of the distance of the fainter wide companion; kinematically based population classifications based on this distance are ambiguous. Finally, we draw attention to the importance of different, but reasonable, choices of Fe i gf-values in our (and other) analyses." @default.
• W2092402016 created "2016-06-24" @default.
• W2092402016 creator A5048884750 @default.
• W2092402016 date "1999-07-01" @default.
• W2092402016 modified "2023-09-27" @default.
• W2092402016 title "Abundances in the Metal‐poor Common Proper Motion Star BD +00°2058A" @default.
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• W2092402016 doi "https://doi.org/10.1086/316391" @default.
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