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http://hdl.handle.net/20.500.12386/29664
Titolo: | Primeval very low-mass stars and brown dwarfs - I. Six new L subdwarfs, classification and atmospheric properties | Autori: | 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 |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 464 | Fascicolo: | 3 | Da pagina:: | 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 |
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