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dc.contributor.authorSneden, Christopher
dc.contributor.authorKim, Hwihyun
dc.contributor.authorMace, Gregory N.
dc.contributor.authorKaplan, Kyle F.
dc.contributor.authorLee, Hye-In
dc.contributor.authorOh, Heeyoung
dc.contributor.authorOh, Jae Sok
dc.contributor.authorPak, Soojong
dc.contributor.authorPark, Chan
dc.contributor.authorPavel, Michael D.
dc.contributor.authorYuk, In-Soo
dc.contributor.authorJaffe, Daniel T.
dc.contributor.authorAfsar, Melike
dc.contributor.authorFrebel, Anna L.
dc.date.accessioned2016-05-23T23:08:16Z
dc.date.available2016-05-23T23:08:16Z
dc.date.issued2016-03
dc.date.submitted2015-10
dc.identifier.issn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1721.1/102639
dc.description.abstractFrom high resolution (R sime 45,000), high signal-to-noise ratio (S/N > 400) spectra gathered with the Immersion Grating Infrared Spectrograph (IGRINS) in the H and K photometric bands, we have derived elemental abundances of two bright, well-known metal-poor halo stars: the red giant HD 122563 and the subgiant HD 140283. Since these stars have metallicities approaching [Fe/H] = −3, their absorption features are generally very weak. Neutral-species lines of Mg, Si, S and Ca are detectable, as well as those of the light odd-Z elements Na and Al. The derived IR-based abundances agree with those obtained from optical-wavelength spectra. For Mg and Si the abundances from the infrared transitions are improvements to those derived from shorter wavelength data. Many useful OH and CO lines can be detected in the IGRINS HD 122563 spectrum, from which derived O and C abundances are consistent to those obtained from the traditional [O i] and CH features. IGRINS high resolutions H- and K-band spectroscopy offers promising ways to determine more reliable abundances for additional metal-poor stars whose optical features are either not detectable, or too weak, or are based on lines with analytical difficulties.en_US
dc.description.sponsorshipNational Science Foundation (U.S.) (CAREER Grant AST-1255160)en_US
dc.language.isoen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.3847/0004-637x/819/2/103en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceIOP Publishingen_US
dc.titleTHE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRAREDen_US
dc.typeArticleen_US
dc.identifier.citationAfşar, Melike, Christopher Sneden, Anna Frebel, Hwihyun Kim, Gregory N. Mace, Kyle F. Kaplan, Hye-In Lee, et al. “THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED.” The Astrophysical Journal 819, no. 2 (March 3, 2016): 103. © 2016 The American Astronomical Societyen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.contributor.departmentMIT Kavli Institute for Astrophysics and Space Researchen_US
dc.contributor.mitauthorFrebel, Anna L.en_US
dc.relation.journalThe Astrophysical Journalen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsAfşar, Melike; Sneden, Christopher; Frebel, Anna; Kim, Hwihyun; Mace, Gregory N.; Kaplan, Kyle F.; Lee, Hye-In; Oh, Heeyoung; Oh, Jae Sok; Pak, Soojong; Park, Chan; Pavel, Michael D.; Yuk, In-Soo; Jaffe, Daniel T.en_US
dspace.embargo.termsNen_US
dc.identifier.orcidhttps://orcid.org/0000-0002-2139-7145
mit.licensePUBLISHER_POLICYen_US


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