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Mechanical heating levels in ultra­fast rotating
dwarfs
J.G, Doyle
A&A, accepted Feb. 96
Using available observational data we have estimated the total radiative out­
put from the chromospheric/coronal plasma as a result of magnetic heating for
several F, G, K & M dwarfs. When tabulated as a function of the bolometric
flux, a clear `levelling­off/saturation' exists for the faster rotators as found pre­
viously when using single spectral lines. However, using recent chromospheric
radiative transfer model calculations it is shown that this `saturation' can be
due to a significantly larger fraction of the losses being radiated by Hydrogen in
the utraviolet/optical/infrared continuum regions. The implication being that
these ultra­fast rotators have a high density chromosphere, plus a high tem­
perature minimum, although additional chromospheric model calculations are
required which include better molecular line opacities plus and an extension of
the models for stars with higher effective temperatures.
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