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Title: Spectral Energy Distributions for Disk and Halo M Dwarfs

Abstract

We have obtained infrared (1-2.5 {mu}m) spectroscopy for 42 halo and disk dwarfs with spectral types M1-M6.5. These data are compared to synthetic spectra generated by the latest model atmospheres of Allard and Hauschildt. Photospheric parameters metallicity, effective temperature, and radius are determined for the sample.We find good agreement between observation and theory except for known problems due to incomplete molecular data for metal hydrides and H2O. The metal-poor M subdwarfs are well matched by the models, as oxide opacity sources are less important in this case. The derived effective temperatures for the sample range from 3600 to 2600 K; at these temperatures grain formation and extinction are not significant in the photosphere. The derived metallicities range from solar to 1/10 solar. The radii and effective temperatures derived agree well with recent models of low-mass stars. The spectra are available in electronic form upon request. (c) 2000 The American Astronomical Society.

Authors:
; ; ; ; ;
Publication Date:
OSTI Identifier:
20217583
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 535; Journal Issue: 2; Other Information: PBD: 1 Jun 2000; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DWARF STARS; INFRARED SPECTRA; STELLAR ATMOSPHERES; TEMPERATURE MEASUREMENT; ELEMENT ABUNDANCE; EXPERIMENTAL DATA

Citation Formats

Leggett, S. K., Allard, F., Dahn, Conard, Hauschildt, P. H., Kerr, T. H., and Rayner, J. Spectral Energy Distributions for Disk and Halo M Dwarfs. United States: N. p., 2000. Web. doi:10.1086/308887.
Leggett, S. K., Allard, F., Dahn, Conard, Hauschildt, P. H., Kerr, T. H., & Rayner, J. Spectral Energy Distributions for Disk and Halo M Dwarfs. United States. doi:10.1086/308887.
Leggett, S. K., Allard, F., Dahn, Conard, Hauschildt, P. H., Kerr, T. H., and Rayner, J. Thu . "Spectral Energy Distributions for Disk and Halo M Dwarfs". United States. doi:10.1086/308887.
@article{osti_20217583,
title = {Spectral Energy Distributions for Disk and Halo M Dwarfs},
author = {Leggett, S. K. and Allard, F. and Dahn, Conard and Hauschildt, P. H. and Kerr, T. H. and Rayner, J.},
abstractNote = {We have obtained infrared (1-2.5 {mu}m) spectroscopy for 42 halo and disk dwarfs with spectral types M1-M6.5. These data are compared to synthetic spectra generated by the latest model atmospheres of Allard and Hauschildt. Photospheric parameters metallicity, effective temperature, and radius are determined for the sample.We find good agreement between observation and theory except for known problems due to incomplete molecular data for metal hydrides and H2O. The metal-poor M subdwarfs are well matched by the models, as oxide opacity sources are less important in this case. The derived effective temperatures for the sample range from 3600 to 2600 K; at these temperatures grain formation and extinction are not significant in the photosphere. The derived metallicities range from solar to 1/10 solar. The radii and effective temperatures derived agree well with recent models of low-mass stars. The spectra are available in electronic form upon request. (c) 2000 The American Astronomical Society.},
doi = {10.1086/308887},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 535,
place = {United States},
year = {2000},
month = {6}
}