Spectral analysis of high resolution near-infrared spectra of ultra cool dwarfs

Abstract

We present an analysis of high resolution spectra in the J band of five ultra cool dwarfs from M6 to L0. A new ab initio water vapour line list and existing line lists of FeH and CrH were used for spectra modelling. We find a good fit for the Mn I 12899.76 A line. This feature is one of the few for which we have a reliable oscillator strength. Other atomic features are present but most of the observed features are FeH and water lines. While we are uncertain about the quality of many of the atomic line parameters, the FeH and CrH line lists predict a number of features which are not apparent in our observed spectra. We infer that the main limiting factor in our spectral analysis is the FeH and CrH molecular spectra.

arXiv comment11 pages, 9 figures, 4 tables; accepted for publication in the Astron. and Astrophys

References in corpus (26)

• The NextGen Model Atmosphere grid for $3000\le \Teff \le 10000\K$
• A high accuracy computed water line list
• An Infrared Spectroscopic Sequence of M, L and T Dwarfs
• New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence
• L' and M' Photometry of Ultracool Dwarfs
• Rotation and Activity in Mid-M to L Dwarfs
• The NIRSPEC Brown Dwarf Spectroscopic Survey. I. Low-Resolution Near-Infrared Spectra
• Infrared Spectra and Spectral Energy Distributions of Late-M- and L-Dwarfs
• An Effective Temperature Scale for Late M and L Dwarfs, from Resonance Absorption Lines of CsI and RbI
• Line Intensities and Molecular Opacities of the FeH $F^4{\Delta }_i-X^4{\Delta }_i$ Transition
• High resolution spectroscopy of ultracool M dwarfs
• New CrH Opacities for the Study of L and Brown Dwarf Atmospheres
• High-resolution Spectra of Very Low-Mass Stars
• Spectral evidence for dust in late-type M dwarfs
• Spectroscopic rotational velocities of brown dwarfs
• The Substellar Mass Function: A Bayesian Approach
• The Smallest Mass Ratio Young Star Spectroscopic Binaries
• The NIRSPEC Brown Dwarf Spectroscopic Survey II: High-Resolution J-Band Spectra of M, L and T Dwarfs
• A multiwavelength radial velocity search for planets around the brown dwarf LP 944-20
• Component Masses of the Young Spectroscopic Binary UZ Tau E
• Analysis of Keck High Resolution Spectra of VB10
• Spectral analysis of water vapour in cool stars
• Carbon Monoxide in low-mass dwarf stars
• Spectral energy distribution for GJ406
• Atomic lines in infrared spectra for ultracool dwarfs
• Mn I hyperfine structure in the near-infrared

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