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IUE observations of pre-main-sequence stars. I - Mg II and Ca II resonance line fluxes for T Tauri starsIUE satellite and Lick 3 m reflector image tube scanner measurements of the Mg II and Ca II resonance lines in a sample of T Tauri stars are the basis of a discussion of the Mg II h and k line emission and the Ca II H and K line emission, within the context of stellar chromospheres. Corroborative evidence is presented for the chromospheric origin of these resonance lines, and chromospheric radiative loss rates in the Mg II and Ca II resonance lines are derived. It is found that the degree of nonradiative heating present in the outer atmospheres of T Tauri stars generally exceeds that of the RS CVn systems, as well as the dMe stars and other active chromospheric dwarfs, and it is inferred that the surfaces of such pre-main sequence stars are covered by regions similar to solar plages. The mean chromospheric electron density of T Tauri stars is determined as 10 to the 11th/cu cm.
Document ID
19820035852
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Giampapa n, M. S.
Date Acquired
August 10, 2013
Publication Date
December 1, 1981
Publication Information
Publication: and C. L. Imhoff. Astrophysical Journal
Subject Category
Astronomy
Accession Number
82A19387
Funding Number(s)
CONTRACT_GRANT: NSG-5235
CONTRACT_GRANT: NSF AST-79-02866
Distribution Limits
Public
Copyright
Other

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