Stellar Magnetic Activity and Long Term Luminosity Variations of Late Type Stars. II. Stellar Activity Periods Based on Parker's Dynamo Theory

Astronomy and Astrophysics – Astronomy

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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.

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