Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96..371s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, July 1988, p. 371-377.
Astronomy and Astrophysics
Astronomy
25
Late Stars, Radio Spectra, Stellar Luminosity, Stellar Rotation, Binary Stars, F Stars, G Stars, K Stars, Starspots, Stellar Activity
Scientific paper
The authors have found a relation between peak radio luminosities measured at 8 GHz and the rotational velocity of 51 late-type F, G, and K stars (including the Sun). The sample includes both single stars and active components of close binary systems, with equatorial surface velocities ranging from 1 to 100 km s-1. A gyrosynchrotron source model originally developed to explain solar microwave bursts could explain the relation. The main parameter depending on rotation rate is the "filling factor", i.e., the fraction of the stellar surface and corona occupied by intense magnetic fields. As the rotation speed increases, the scale size of the coronal structures emitting microwave gyrosynchrotron radiation increases, and there is a corresponding increase in the area of the surface covered by intense starspot magnetic fields. However, the peak magnetic field of the starspots probably does not increase significantly above observed sunspot values.
Innis John L.
Nelson Graam J.
Slee Owen Bruce
Stewart Ron T.
Wright Alan E.
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