Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.287c&link_type=abstract
In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 287-290 (SEE N89-10682 01-89)
Astronomy and Astrophysics
Astronomy
1
Iue, Skylab Program, Solar Radiation, Spaceborne Astronomy, Stellar Activity, Stellar Radiation, Ultraviolet Astronomy, Ultraviolet Spectra, Chromosphere, Late Stars, Stellar Magnetic Fields
Scientific paper
Low-resolution IUE SWP spectra of late-type stars and high-resolution Skylab spectra of spatially-resolved solar regions of various degrees of magnetic activity (quiet areas, plages, flares) are compared. The high-resolution solar spectra are degraded to the same resolution of IUE and the solar and stellar data are analyzed in exactly the same way. It is shown that the different levels of chromospheric and transition region emission observed in stars of similar spectral types are paralleled by a similar behavior displayed by solar regions of different magnetic activity. Spatially-resolved solar data obey the same flux-flux relationships as the stellar data over more than three orders of magnitude, with virtually the same slope and similar scatter. The similar behavior of the solar and stellar UV line fluxes, together with the dependence of the stellar fluxes on rotation, are indirect evidence that stellar activity is of magnetic origin and likely results from a dynamo process. The contribution of blends, under different activity conditions, to line fluxes derived from IUE low-reslution spectra varies depending on the activity level, and may be substantial for the lines of O I at 1304 A and He II at 1640 A.
Cappelli Andrea
Cerruti-Sola Monica
Cheng Chung-Chieh
Pallavicini Roberto
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