On cyclic activity of the Sun and solar-type stars

Details On cyclic activity of the Sun and solar-type stars On cyclic activity of the Sun and solar-type stars

2011-08-27

arxiv.org/abs/1108.5432v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 4 figures. arXiv admin note: substantial text overlap with arXiv:1102.3976

Scientific paper

The cyclicity of 33 solar-type stars that are similar to 11-year and to the quasi-biennial variations of solar radiation have studied. Our calculation were based on new simultaneous observations of the flux variations of the photospheric and chromospheric emissions of 33 solar-type stars and the Sun during the HK project that were conducted over the last 20 years. The method of Fast Fourier Transform was applied to these observed data. In addition to the known cyclic chromospheric emission variations of stars at the 11-year time scale, which were discovered at the Mount Wilson Observatory, we found a recurrences on the quasi-biennial time scale. The results of calculations of periods of the star's fluxes variations at the 11-year and quasi-biennial time scales are presented

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