Cover Image

Primeval very low-mass stars and brown dwarfs: I. Six new L subdwarfs, classification and atmospheric properties

Show other versions (1)

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...

Full description

Saved in:
Bibliographic Details
Main Authors: Zhang, Zeng Hua (Author) , Homeier, Derek (Author)
Format: Article (Journal)
Language:English
Published: 2017
In: Monthly notices of the Royal Astronomical Society
Year: 2016, Volume: 464, Issue: 3, Pages: 3040-3059
ISSN:1365-2966
DOI:10.1093/mnras/stw2438
Online Access:Verlag, Volltext: http://dx.doi.org/10.1093/mnras/stw2438
Verlag, Volltext: https://academic.oup.com/mnras/article/464/3/3040/2454780
Get full text
Author Notes: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
Description
Summary: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.
Item Description:Published: 26 September 2016
Gesehen am 02.08.2018
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stw2438

Similar Items