Magnetic cycle of LQ Hydrae: observational indications and dynamo model

Details Magnetic cycle of LQ Hydrae: observational indications and dynamo model Magnetic cycle of LQ Hydrae: observational indications and dynamo model

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.318.1171k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 318, Issue 4, pp. 1171-1176.

Astronomy and Astrophysics

Astronomy

15

Stars: Individual: Hd 82558, Stars: Late-Type, Stars: Magnetic Fields

Scientific paper

We present a model for the differential rotation and dynamo activity of the young rapidly rotating K0 dwarf LQ Hya (Prot=1.6d). As might be expected from observations of the similar rapid rotator AB Dor, the predicted differential rotation is small (~=0.8per cent) but extremely efficient in generating magnetic fields. The dynamo, which is of a distributed type, produces a globally axisymmetric field with radial and azimuthal components that are of the same magnitude and display a phase-lag in their evolution of about π/2. This is consistent with the long-term Zeeman-Doppler imaging study by Donati. The latitudinal distribution of flux is, however, a little different from that observed and the cycle period of 3.2yr is somewhat shorter than suggested by the observations.

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