Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7283
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dc.contributor.authorSusmitha Rani, A-
dc.contributor.authorSivarani, T-
dc.contributor.authorBeers, T. C-
dc.contributor.authorFleming, S-
dc.contributor.authorMahadevan, S-
dc.contributor.authorGe, J-
dc.date.accessioned2020-11-19T13:58:04Z-
dc.date.available2020-11-19T13:58:04Z-
dc.date.issued2016-05-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Vol. 458, No. 3, pp. 2648-2656en_US
dc.identifier.issn1365-2966-
dc.identifier.urihttp://prints.iiap.res.in/handle/2248/7283-
dc.descriptionRestricted Access © Royal Astronomical Society http://dx.doi.org/10.1093/mnras/stw413en_US
dc.description.abstractWe 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 Multi-object Apache Point Observatory Radial Velocity Exoplanet Large-area Survey spectroscopic pre-survey of some 20 000 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 underabundant, [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 highresolution) 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.en_US
dc.language.isoenen_US
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.subjectGalaxy: haloen_US
dc.subjectStars: metal pooren_US
dc.subjectStars: abundancesen_US
dc.subjectStars: Population IIen_US
dc.titleAbundance analysis of SDSS J134338.67+484426.6; an extremely metal-poor star from the MARVELS pre-surveyen_US
dc.typeArticleen_US
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