A Dynamo Interpretation of Stellar Activity Cycles

Baliunas, S. L.; Nesme-Ribes, E.; Sokoloff, Dmitry D.; Soon, Willie

doi:10.1086/177014

Cited by 132 publications

(160 citation statements)

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“…5. The quantity log(P cyc /P rot ) vs. log(1/P rot ), as in Baliunas et al (1996b). The plot includes the results of the present investigation and those from the literature: Messina & Guinan (2002, circles) and Frick et al (2004, crosses).…”

Section: Relationsmentioning

confidence: 77%

“…Durney & Stenflo (1972) presented a first theoretical forecast, namely with increasing rotation rate, cycle periods should be decreasing. Baliunas et al (1996b) summarised knowledge on the dynamo interpretation of stellar activity cycles prior to 1996.…”

Section: Introductionmentioning

confidence: 99%

“…Multiple cycles, analogous to the known solar multicyclic variability, were recovered by Baliunas et al (1996b) from the records of the Ca II index. Using these Ca index data supplemented with photometric results of active dwarfs and giants, Saar & Brandenburg (1999) studied the time variability of stellar cycles and multiple cycles on the evolutionaly timescale, drew the distribution of P rot /P cyc in the function of the Rossby number, and compared the results with theoretical models.…”

Section: Introductionmentioning

confidence: 99%

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Multiple and changing cycles of active stars

Oláh¹,

Kollath²,

Granzer

et al. 2009

A&A

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Aims. We study the time variations in the cycles of 20 active stars based on decade-long photometric or spectroscopic observations. Methods. A method of time-frequency analysis, as discussed in a companion paper, is applied to the data. Results. Fifteen stars definitely show multiple cycles, but the records of the rest are too short to verify a timescale for a second cycle. The cycles typically show systematic changes. For three stars, we found two cycles in each of them that are not harmonics and vary in parallel, indicating a common physical mechanism arising from a dynamo construct. The positive relation between the rotational and cycle periods is confirmed for the inhomogeneous set of active stars. Conclusions. Stellar activity cycles are generally multiple and variable.

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Section: Relationsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multiple and changing cycles of active stars

Oláh¹,

Kollath²,

Granzer

et al. 2009

A&A

Self Cite

194

216

View full text Add to dashboard Cite

show abstract

“…This correlation is even stronger when using the Rossby number (Ro = P rot /τ ) that takes into account the convection turnover time τ at the base of the stellar convective envelope (Noyes et al 1984;Baliunas et al 1996). As the star rotates faster, its cycle period is found to be shorter.…”

Section: Solar-stellar Connectionmentioning

confidence: 99%

“…Theoretical considerations to interpret stellar magnetism based on classical 2-D mean field α-ω dynamo models (Durney & Latour 1976, Knobloch et al 1981Baliunas et al 1996) naturally find correlations between rotation rate and stellar activity. In particular it is found that both magnetic field generation and the dynamo number D (i.e.…”

Section: -D Mean Field Modelsmentioning

confidence: 99%