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Title:
Outer atmospheres of cool stars. XII - A survey of IUE ultraviolet emission line spectra of cool dwarf stars
Authors:
Linsky, J. L.; Bornmann, P. L.; Carpenter, K. G.; Hege, E. K.; Wing, R. F.; Giampapa, M. S.; Worden, S. P.
Affiliation:
AA(Joint Institute for Laboratory Astrophysics, Boulder, CO), AB(Joint Institute for Laboratory Astrophysics, Boulder, CO), AC(Ohio State University, Columbus, OH), AD(Steward Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 670-694. (ApJ Homepage)
Publication Date:
09/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cool Stars, Dwarf Stars, Late Stars, Line Spectra, Stellar Atmospheres, Stellar Luminosity, Ultraviolet Spectra, Chromosphere, Iue, M Stars, Photometry, Spectrum Analysis, Stellar Flares, Stellar Magnetic Fields
DOI:
10.1086/160288
Bibliographic Code:
1982ApJ...260..670L

Abstract

Quantitative information is obtained on the chromospheres and transition regions of M dwarf stars, in order to determine how the outer atmospheres of dMe stars differ from dM stars and how they compare with the outer atmospheres of quiet and active G and K type dwarfs. IUE spectra of six dMe and four dM stars, together with ground-based photometry and spectroscopy of the Balmer and Ca II H and K lines, show no evidence of flares. It is concluded, regarding the quiescent behavior of these stars, that emission-line spectra resemble that of the sun and contain emission lines formed in regions with 4000-20,000 K temperatures that are presumably analogous to the solar chromosphere, as well as regions with temperatures of 20,000-200,000 K that are presumably analogous to the solar transition region. Emission-line surface fluxes are proportional to the emission measure over the range of temperatures at which the lines are formed.

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Part  1     Part  2     Part  3     Part  4     Part  6     Part  5     Part  7     Part  9     Part  8     Part 10     Part 11     Part 12     Part 13     Part 14     Part 15    


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