NICS-TNG Low-Resolution 0.85–2.45 micron Spectra of L Dwarfs: A Near-Infrared Spectral Classification Scheme for Faint Dwarfs

2001 ◽  
Vol 552 (2) ◽  
pp. L147-L150 ◽  
Author(s):  
L. Testi ◽  
F. D’Antona ◽  
F. Ghinassi ◽  
J. Licandro ◽  
A. Magazzù ◽  
...  
Keyword(s):  
Near Infrared ◽  
Classification Scheme ◽  
Spectral Classification ◽  
Low Resolution ◽  
Infrared Spectral ◽  
L Dwarfs

scholarly journals An Efficient Low-Resolution NIR Classification Scheme for M, L, and T dwarfs and Its Application to Young BDs

2003 ◽  
Vol 211 ◽  
pp. 359-360
Author(s):  
L. Testi ◽  
A. Natta ◽  
C. Baffa ◽  
G. Comoretto ◽  
S. Gennari ◽  
...  
Keyword(s):  
Near Infrared ◽  
Classification Scheme ◽  
Optical Element ◽  
System Throughput ◽  
Single Shot ◽  
Low Resolution ◽  
Near Infrared Spectra ◽  
Infrared Spectral ◽  
High System ◽  
Large Telescopes

We present the preliminary results of a programme aimed at defining a low-resolution near-infrared spectral classification scheme for faint M, L, and T-dwarfs. The method is based on the global shape of R˜100 complete near-infrared spectra from 0.8 to 2.4μm as obtained through a high-throughput prism-based optical element, the Amici device, mounted inside the NICS instrument at the TNG 3.5m telescope (Baffa et al. 2001; Oliva 2000). The aim of our project is to provide an efficient classification scheme based on very low-resolution near infrared spectroscopy, which can be carried on at a 4m-class telescope. The results for the L-type dwarfs have already been presented in Testi et al. (2001), sample spectra for the M and T-dwarfs range are shown in Figure 1. A preliminary application of the method to the classification of young embedded brown-dwarf candidates has been successfully attempted by Testi et al. (2002) and Natta et al. (2002). The method is shown to be accurate and competitive: the high system throughput coupled with the possibility of obtaining in a “single shot” the complete spectrum of the objects make the NICS/TNG system more efficient than existing large telescopes.

scholarly journals A Unified Near‐Infrared Spectral Classification Scheme for T Dwarfs

2006 ◽  
Vol 637 (2) ◽  
pp. 1067-1093 ◽  
Author(s):  
Adam J. Burgasser ◽  
T. R. Geballe ◽  
S. K. Leggett ◽  
J. Davy Kirkpatrick ◽  
David A. Golimowski
Keyword(s):  
Near Infrared ◽  
Classification Scheme ◽  
Spectral Classification ◽  
Infrared Spectral

scholarly journals Near-Infrared Spectral Classification of Late M and L Dwarfs

2001 ◽  
Vol 121 (3) ◽  
pp. 1710-1721 ◽  
Author(s):  
I. Neill Reid ◽  
A. J. Burgasser ◽  
K. L. Cruz ◽  
J. Davy Kirkpatrick ◽  
J. E. Gizis
Keyword(s):  
Near Infrared ◽  
Spectral Classification ◽  
Infrared Spectral ◽  
L Dwarfs

NIR Low-Resolution Spectroscopy of L-Dwarfs: An Efficient Classification Scheme for Faint Dwarfs

2003 ◽  
pp. 187-194
Author(s):  
Leonardo Testi ◽  
Francesca D’Antona ◽  
Francesca Ghinassi ◽  
Javier Licandro ◽  
Antonio Magazzù ◽  
...  
Keyword(s):  
Classification Scheme ◽  
Low Resolution ◽  
L Dwarfs

NIR Low-Resolution Spectroscopy of L-Dwarfs: An Efficient Classification Scheme for Faint Dwarfs

2002 ◽  
pp. 186-192
Author(s):  
Leonardo Testi ◽  
Francesca D’Antona ◽  
Francesca Ghinassi ◽  
Javier Licandro ◽  
Antonio Magazzù ◽  
...  
Keyword(s):  
Classification Scheme ◽  
Low Resolution ◽  
L Dwarfs

The stellar populations of deeply embedded young clusters: Near-infrared spectral classification

2007 ◽  
pp. 175-186 ◽  
Author(s):  
Michael R. Meyer ◽  
Suzan Edwards ◽  
Kenneth Hinkle ◽  
Michael F. Skrutskie ◽  
Stephen E. Strom
Keyword(s):  
Near Infrared ◽  
Stellar Populations ◽  
Spectral Classification ◽  
Infrared Spectral ◽  
Young Clusters

scholarly journals The Classification of L Dwarfs: Is It Based on Clouds or Temperature?

2003 ◽  
Vol 211 ◽  
pp. 355-358 ◽  
Author(s):  
Denise C. Stephens
Keyword(s):  
Effective Temperature ◽  
Classification System ◽  
Near Infrared ◽  
Spectral Indices ◽  
Combined Use ◽  
Infrared Spectral ◽  
L Dwarfs

A continuous L dwarf classification sequence requires the combined use of far optical (visible) and near infrared spectral indices. However, the visible and near infrared indices currently in use assign subtypes that differ by up to three subclasses due to differences in cloud opacity for objects with the same effective temperature. Therefore, it may be impossible to combine visible and near infrared spectral indices to create one L dwarf classification system, and two classification variables may be necessary.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

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