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outer atmospheres of cool stars. xii - a survey of iue ultraviolet emission line spectra of cool dwarf starsQuantitative 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.
Document ID
19820061070
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Linsky, J. L.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Bornmann, P. L.
(Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Carpenter, K. G.
(Ohio State University Columbus, OH, United States)
Hege, E. K.
(Steward Observatory Tucson, AZ, United States)
Wing, R. F.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Giampapa, M. S.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Worden, S. P.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Date Acquired
August 10, 2013
Publication Date
September 15, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-82
CONTRACT_GRANT: NGL-06-003-057
CONTRACT_GRANT: NSG-5247
CONTRACT_GRANT: NSG-5368
Distribution Limits
Public
Copyright
Other