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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29664
Title: Primeval very low-mass stars and brown dwarfs - I. Six new L subdwarfs, classification and atmospheric properties
Authors: Zhang, Z. H.
Pinfield, D. J.
Gálvez-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, Richard Laurence 
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 464
Issue: 3
First Page: 3040
Abstract: We 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, and ULAS J124425.75+102439.3). We examined the spectral type and metallicity classification of subclasses of known L subdwarfs. We summarized 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 and 2700 K, which are higher than similar-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.
URI: http://hdl.handle.net/20.500.12386/29664
URL: https://academic.oup.com/mnras/article/464/3/3040/2454780
ISSN: 0035-8711
DOI: 10.1093/mnras/stw2438
Bibcode ADS: 2017MNRAS.464.3040Z
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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