2001/04/08 by L. Testi, F. D’Antona, F. D'Antona +11 · 3 citations
Physics and Astronomy · #Adaptive optics and wavefront sensing #Artificial intelligence #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Brown dwarf #Classification scheme #Computer science #Infrared #Near-infrared spectroscopy #Optics #Physics #Prism #Resolution (logic) #Spectral line #Spectral resolution #Spectrograph #Spectroscopy #Stars #Stellar classification #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/320348
10 pages, 3 figures, ApJ Letters in press
arxiv created 2001/04/08 · openalex publication_date 2001/05/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present complete near-infrared (0.85-2.45 μm), low-resolution (~100) spectra of a sample of 26 disk L dwarfs with reliable optical spectral type classification. The observations have been obtained with the Near Infrared Camera and Spectrograph at the Telescopio Nazionale Galileo 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 classify accurately L dwarfs earlier than L6.