Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jkas...19...91p&link_type=abstract
Journal of Korean Astronomical Society, vol. 19, no. 2, p. 91-107
Astronomy and Astrophysics
Astronomy
Scientific paper
Making use of our extended version of Opik's convection theory, we have calculated magnetic cycle periods of the sun and late type stars by using Parker's dynamo theory, where we have included the non-linear effect. We presented a relationship between the computed cycle period and spectral type to analyze observed magnetic activities of the late type stars and long-term luminosity variables. It is found that (1) the stellar magnetic-cycle period increases towards the later spectral type, (2) the rapid rotation facilities the activity-related luminosity variation of stars later than about K5, (3) differential rotation play a critical role in determinating the magnetic activity-cycle period, and (4) the non-local effect should be taken into account in order to understand the observed long-term luminosity variations.
Park Chang Bum
Yun Hong Sik
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