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

    Authors

    Y. Lyubchik; H. R. A. Jones; Y. V. Pavlenko; E. Martin; I. S. McLean; L. Prato; R. J. Barber;J. Tennyson

    Comments

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    Abbreviated Journal Title

    Astron. Astrophys.

    Keywords

    line : identification; stars : atmospheres; stars : low-mass; brown; dwarfs; stars : late-type; POTENTIAL-ENERGY SURFACE; HYPERFINE-STRUCTURE; TEMPERATURE SCALE; BROWN; DWARFS; LINE LIST; SEQUENCE; WATER; STARS; TRANSITION; OPACITIES; Astronomy & Astrophysics

    Abstract

    Aims. We present an analysis of high resolution spectra in the J band of five ultra cool dwarfs from M6 to L0. Methods. We make use of a new ab initio water vapour line list and existing line lists of FeH and CrH for modelling the observations. Results. We find a good fit for the Mn I 12 899.76 angstrom 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 H(2)O 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.

    Journal Title

    Astronomy & Astrophysics

    Volume

    473

    Issue/Number

    1

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    257

    Last Page

    264

    WOS Identifier

    WOS:000249957800028

    ISSN

    0004-6361

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