The far-infrared and X-ray radiation of active late-type stars - Suggestions for strong spottedness

Details The far-infrared and X-ray radiation of active late-type stars - Suggestions for strong spottedness The far-infrared and X-ray radiation of active late-type stars - Suggestions for strong spottedness

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402l...9k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 402, no. 1, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

9

Far Infrared Radiation, Late Stars, M Stars, Starspots, Stellar Activity, X Ray Spectra, Dwarf Stars, Emission Spectra, Stellar Coronas, Stellar Magnetic Fields

Scientific paper

The IRAS observations and the X-ray data of active late-type stars are compared with recent measurements of magnetic fields. The deviations of the fluxes observed at the 12-micron band from those predicted by blackbody radiation in the visible for active K and M stars show a correlation with the values of observed magnetic fluxes. The L(x)/L(bol) ratio increases considerably for stars with large IR excess. All these features could be understood if we assume that stellar surfaces are spotted more heavily than follows from the analysis of rotational modulation of optical emission.

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