Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274..711j&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 3, pp. 711-716.
Astronomy and Astrophysics
Astronomy
3
Polarization, Stars: Coronae, Stars: Individual: Hd 101379, Stars: Late-Type, Stars: Magnetic Fields, Radio Continuum: Stars
Scientific paper
A programme to investigate the coronae of late-type stars using four-frequency radio continuum spectra from the Australia Telescope Compact Array has yielded several spectra of HD 101379, including two flare spectra in which fluxes in excess of 30 mJy were observed. In one of the flares the degree of circular polarization was less than 1 per cent, but in the other ~=11 per cent circular polarization was observed at 8.64 GHz. The spectra are interpreted in terms of the gyrosynchrotron theory. Our modelling cannot reproduce the polarization and spectral properties of these fluxes with a simple magnetic field configuration such as a dipole or single loop. Instead, we are forced to assume that the radio flux comes from a large number of relatively thin magnetic loops, whose footprints cover about 2 per cent of the stellar surface. The loops probably extend out to 4 stellar radii from the star's centre. Also, we must assume mixed polarity loops to explain the low degree of polarization observed.
Jones Kenneth L.
Nelson Graam J.
Stewart Ron T.
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