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dc.contributor.authorZhang, Z. H.
dc.contributor.authorPinfield, D. J.
dc.contributor.authorGalvez-Ortiz, M. C.
dc.contributor.authorBurningham, B.
dc.contributor.authorLodieu, N.
dc.contributor.authorMarocco, F.
dc.contributor.authorBurgasser, A. J.
dc.contributor.authorDay-Jones, A. C.
dc.contributor.authorAllard, F.
dc.contributor.authorJones, H. R. A.
dc.contributor.authorHomeier, D.
dc.contributor.authorGomes, J.
dc.contributor.authorSmart, R. L.
dc.date.accessioned2017-05-30T18:43:11Z
dc.date.available2017-05-30T18:43:11Z
dc.date.issued2017-01-01
dc.identifier.citationZhang , Z H , Pinfield , D J , Galvez-Ortiz , M C , Burningham , B , Lodieu , N , Marocco , F , Burgasser , A J , Day-Jones , A C , Allard , F , Jones , H R A , Homeier , D , Gomes , J & Smart , R L 2017 , ' Primeval very low-mass stars and brown dwarfs. I. Six new L subdwarfs, classification and atmospheric properties ' , Monthly Notices of the Royal Astronomical Society , vol. 464 , no. 3 , pp. 3040-3059 . https://doi.org/10.1093/mnras/stw2438
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 10713833
dc.identifier.otherPURE UUID: e833038b-2d41-4ddc-8458-34a938bc27d2
dc.identifier.otherArXiv: http://arxiv.org/abs/1609.07181v2
dc.identifier.otherScopus: 85017249733
dc.identifier.otherORCID: /0000-0003-4600-5627/work/64327351
dc.identifier.urihttp://hdl.handle.net/2299/18239
dc.descriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved
dc.description.abstractWe have conducted a search for L subdwarf candidates within the photometric catalogues of the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey. Six of our candidates are confirmed as L subdwarfs spectroscopically at optical and/or near infrared wavelengths. We also present new optical spectra of three previously known L subdwarfs (WISEA J001450.17-083823.4, 2MASS J00412179+3547133, ULAS J124425.75+102439.3). We examined the spectral types and metallicity subclasses classification of known L subdwarfs. We summarised the spectroscopic properties of L subdwarfs with different spectral types and subclasses. We classify these new L subdwarfs by comparing their spectra to known L subdwarfs and L dwarf standards. We estimate temperatures and metallicities of 22 late type M and L subdwarfs by comparing their spectra to BT-Settl models. We find that L subdwarfs have temperatures between 1500 K and 2700 K, which are higher than similarly-typed L dwarfs by around 100-400 K depending on different subclasses and subtypes. We constrained the metallicity ranges of subclasses of M, L and T subdwarfs. We also discussed the spectral type and absolute magnitude relationships for L and T subdwarfs.en
dc.format.extent20
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectbrown dwarfs
dc.subjectstars: chemically peculiar
dc.subjectstars: individual: ULAS j021642+004005.6, ULAS j124947.04+095019.8, SDSS J133348.24+273508.8, ULAS J133836.97-022910.7, SDSS J134749.74+333601.7, ULAS J151913.03-000030.0
dc.subjectstars: low mass
dc.subjectstars: Population II
dc.subjectSubdwarfs
dc.titlePrimeval very low-mass stars and brown dwarfs. I. Six new L subdwarfs, classification and atmospheric propertiesen
dc.contributor.institutionSchool of Engineering and Technology
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stw2438
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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