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Title: Abundance analysis of SDSS J134338.67+484426.6; an extremely metal-poor star from the MARVELS pre-survey
Authors: Susmitha Rani, A
Sivarani, T
Beers, T. C
Fleming, S
Mahadevan, S
Ge, J
Keywords: Galaxy: halo;Stars: metal poor;Stars: abundances;Stars: Population II
Issue Date: 21-May-2016
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 458, No. 3, pp. 2648 - 2656
Abstract: We present an elemental-abundance analysis of an extremely metal-poor (EMP; [Fe/H] <−3.0) star, SDSS J134338.67+484426.6, identified during the course of the MARVELS spectroscopic pre-survey of some 20000 stars to identify suitable candidates for exoplanet searches. This star, with an apparent magnitude V = 12.14, is the lowest metallicity star found in the pre-survey, and is one of only ∼20 known EMP stars that are this bright or brighter. Our high-resolution spectroscopic analysis shows that this star is a subgiant with [Fe/H] = −3.42, having “normal” carbon and no enhancement of neutron-capture abundances. Strontium is under-abundant, [Sr/Fe] =−0.47, but the derived lower limit on [Sr/Ba] indicates that Sr is likely enhanced relative to Ba. This star belongs to the sparsely populated class of α-poor EMP stars that exhibit low ratios of [Mg/Fe], [Si/Fe], and [Ca/Fe] compared to typical halo stars at similar metallicity. The observed variations in radial velocity from several epochs of (low- and high-resolution) spectroscopic follow-up indicate that SDSS J134338.67+484426.6 is a possible long-period binary. We also discuss the abundance trends in EMP stars for r-process elements, and compare with other magnesium-poor stars.
Description: Restricted Access
ISSN: 1365-2966
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Appears in Collections:Publications based on data from IAO, Hanle
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