Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-08
Astronomy and Astrophysics
Astrophysics
10 pages, 3 figures, ApJ Letters in press
Scientific paper
10.1086/320348
We present complete near-infrared (0.85-2.45 um), low-resolution (~100) spectra of a sample of 26 disk L-dwarfs with reliable optical spectral type classification. The observations have been obtained with NICS at the TNG using a prism-based optical element (the Amici device) that provides a complete spectrum of the source on the detector. Our observations show that low-resolution near-infrared spectroscopy can be used to determine the spectral classification of L-dwarfs in a fast but accurate way. We present a library of spectra that can be used as templates for spectral classification of faint dwarfs. We also discuss a set of near-infrared spectral indices well correlated with the optical spectral types that can be used to accurately classify L-dwarfs earlier than L6.
D'Antona Francesca
Ghinassi Francesca
Licandro Javier
Magazzu' A.
Maiolino Roberto
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