Analysis of Keck HIRES Spectra of Early L‐Type Dwarfs | Zendy

A. Schweitzer | Zendy; John E. Gizis | Zendy; P. H. Hauschildt | Zendy; F. Allard | Zendy; I. Neill Reid | Zendy

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Analysis of Keck HIRES Spectra of Early L‐Type Dwarfs

Author(s) -

A. Schweitzer,

John E. Gizis,

P. H. Hauschildt,

F. Allard,

I. Neill Reid

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/321486

Subject(s) - physics , astrophysics , brown dwarf , spectral line , opacity , flux (metallurgy) , stellar classification , line (geometry) , condensation , stars , astronomy , optics , mathematics , geometry , chemistry , meteorology , organic chemistry

We present analyses of high resolution and medium resolution spectra of earlyL dwarfs. We used our latest set of model atmospheres to reproduce and analyzethe observed features. We can model the optical flux and the atomic lineprofiles with the best accuracy to date. The models used to reproduce theobservations include dust condensation and dust opacities. Compared to previousstudies using older models we find that our dust treatment is much improved.The derived parameters for the objects are well in the expected range for oldvery low mass objects. This is also supported by the absence of Li in most ofthe objects. For the objects showing Li we can be almost certain that those arebrown dwarfs. However, a spectral analysis in general, and this one inparticular can only very roughly determine mass and age.Comment: AASTeX5.0. 26 pages, including all figures, Accepted for Ap

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