Primeval very low-mass stars and brown dwarfs: I. Six new L subdwarfs, classification and atmospheric properties
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 spe...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2017
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2016, Jahrgang: 464, Heft: 3, Pages: 3040-3059 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stw2438 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1093/mnras/stw2438 Verlag, Volltext: https://academic.oup.com/mnras/article/464/3/3040/2454780 
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| Verfasserangaben: | Z.H. Zhang (张曾华), D.J. Pinfield, M.C. Gálvez-Ortiz, B. Burningham, N. Lodieu, F. Marocco, A.J. Burgasser, A.C. Day-Jones, F. Allard, H.R.A. Jones, D. Homeier, J. Gomes and R.L. Smart |
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| 245 | 1 | 0 | |a Primeval very low-mass stars and brown dwarfs |b I. Six new L subdwarfs, classification and atmospheric properties |c Z.H. Zhang (张曾华), D.J. Pinfield, M.C. Gálvez-Ortiz, B. Burningham, N. Lodieu, F. Marocco, A.J. Burgasser, A.C. Day-Jones, F. Allard, H.R.A. Jones, D. Homeier, J. Gomes and R.L. Smart |
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| 520 | |a 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. | ||
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