dc.contributor.author | Zhang, Z. H. | |
dc.contributor.author | Galvez-Ortiz, M. C. | |
dc.contributor.author | Pinfield, D. J. | |
dc.contributor.author | Burgasser, A. J. | |
dc.contributor.author | Lodieu, N. | |
dc.contributor.author | Jones, H. R. A. | |
dc.contributor.author | Martin, E. L. | |
dc.contributor.author | Burningham, B. | |
dc.contributor.author | Homeier, D. | |
dc.contributor.author | Allard, F. | |
dc.contributor.author | Osorio, M. R. Zapatero | |
dc.contributor.author | Smith, L. C. | |
dc.contributor.author | Smart, R. L. | |
dc.contributor.author | Marti, B. Lopez | |
dc.contributor.author | Marocco, F. | |
dc.contributor.author | Rebolo, R. | |
dc.date.accessioned | 2019-01-03T14:52:24Z | |
dc.date.available | 2019-01-03T14:52:24Z | |
dc.date.issued | 2018-11-11 | |
dc.identifier.citation | Zhang , Z H , Galvez-Ortiz , M C , Pinfield , D J , Burgasser , A J , Lodieu , N , Jones , H R A , Martin , E L , Burningham , B , Homeier , D , Allard , F , Osorio , M R Z , Smith , L C , Smart , R L , Marti , B L , Marocco , F & Rebolo , R 2018 , ' Primeval very low-mass stars and brown dwarfs - IV. New L subdwarfs, Gaia astrometry, population properties, and a blue brown dwarf binary ' , Monthly Notices of the Royal Astronomical Society , vol. 480 , no. 4 , pp. 5447-5474 . https://doi.org/10.1093/mnras/sty2054 | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1807.10560v4 | |
dc.identifier.other | ORCID: /0000-0003-4600-5627/work/64327368 | |
dc.identifier.uri | http://hdl.handle.net/2299/20913 | |
dc.description | 30 pages, 23 figures | |
dc.description.abstract | We present 27 new L subdwarfs and classify five of them as esdL and 22 as sdL. Our L subdwarf candidates were selected with the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey. Spectroscopic follow-up was carried out primarily with the OSIRIS spectrograph on the Gran Telescopio Canarias. Some of these new objects were followed up with the X-shooter instrument on the Very Large Telescope. We studied the photometric properties of the population of known L subdwarfs using colour-spectral type diagrams and colour-colour diagrams, by comparison with L dwarfs and main-sequence stars, and identified new colour spaces for L subdwarf selection/study in current and future surveys. We further discussed the brown dwarf transition-zone and the observational stellar/substellar boundary. We found that about one-third of 66 known L subdwarfs are substellar objects, with two-thirds being very low-mass stars. We also present the Hertzsprung-Russell diagrams, spectral type-absolute magnitude corrections, and tangential velocities of 20 known L subdwarfs observed by the Gaia astrometry satellite. One of our L subdwarf candidates, ULAS J233227.03+123452.0, is a mildly metal-poor spectroscopic binary brown dwarf: a ~L6p dwarf and a ~T4p dwarf. This binary is likely a thick disc member according to its kinematics. | en |
dc.format.extent | 28 | |
dc.format.extent | 7488475 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | Binaries: spectroscopic | |
dc.subject | Brown dwarfs | |
dc.subject | Stars: chemically peculiar | |
dc.subject | Stars: Population II | |
dc.subject | Stars: subdwarfs | |
dc.subject | Astronomy and Astrophysics | |
dc.subject | Space and Planetary Science | |
dc.title | Primeval very low-mass stars and brown dwarfs - IV. New L subdwarfs, Gaia astrometry, population properties, and a blue brown dwarf binary | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Science & Technology Research Institute | |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | Centre of Data Innovation Research | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=85055353031&partnerID=8YFLogxK | |
dc.identifier.url | https://arxiv.org/abs/1807.10560v4 | |
rioxxterms.versionofrecord | 10.1093/mnras/sty2054 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |