Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....96..369b&link_type=abstract
Astronomy and Astrophysics, vol. 96, no. 1-2, Mar. 1981, p. 369-372.
Astronomy and Astrophysics
Astrophysics
25
Dynamo Theory, Main Sequence Stars, Stellar Magnetic Fields, Stellar Radiation, X Ray Sources, Energy Dissipation, Stellar Coronas, Stellar Luminosity
Scientific paper
It is noted that the discovery of stellar coronae for main sequence stars later than FO through K and M is one of the most important results of Einstein satellite observations. A theoretical estimate is given of the surface X-ray fluxes for these stars. It is noted that at coronal temperatures greater than 2,000,000 K X-ray luminosity is given by the radiative losses of systems of magnetic loops forming the active regions on the star's surface, namely by the summation of the single loop emission over the total number of loops in the active regions. Passing from luminosities to fluxes, it is shown that the surface X-ray flux is independent of the dimensions of the active regions present on the star's surface and depends only on the surface turbulence and the typical strength of the magnetic field in the active regions. The field twisted by turbulent motions is identified with the emerging mean toroidal field as computed by stellar dynamo models.
Belvedere Gaetano
Chiuderi Claudio
Paterno' Lucio
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