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Einstein Observatory coronal temperatures of late-type starsThe results are presented of a survey of the coronal temperatures of late-type stars using the Einstein Observatory IPC. The spectral analysis shows that the frequently found one- and two-temperature descriptions are mainly influenced by the SNR of the data and that models using continuous emission measure distributions can provide equally adequate and physically more meaningful and more plausible descriptions. Intrinsic differences in differential emission measure distributions are found for four groups of stars. M dwarfs generally show evidence for high-temperature gas in conjunction with lower-temperature material, while main-sequence stars of types F and G have the high-temperature component either absent or very weak. Very hot coronae without the lower-temperature component appearing in dwarf stars are evident in most of the giant stars studied. RS CVn systems show evidence for extremely hot coronae, sometimes with no accompanying lower-temperature material.
Document ID
19910033882
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Schmitt, J. H. M. M. (Max-Planck-Institut fuer Physik und Astrophysik Garching, Federal Republic of Germany, United States)
Collura, A. (CNR Istituto per le Applicazioni Interdisciplinari della Fisica, Palermo, Italy)
Sciortino, S. (Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Vaiana, G. S. (Palermo Osservatorio Astronomico, Italy)
Harnden, F. R., Jr. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
December 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 365
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS8-30751
Distribution Limits
Public
Copyright
Other