期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 826, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8205/826/1/L2
关键词
stars: activity; stars: evolution; stars: magnetic field; stars: rotation; stars: solar-type
资金
- NASA [NNX15AF13G]
- Newkirk Fellowship at the High Altitude Observatory
- NASA [NNX15AF13G, 804671] Funding Source: Federal RePORTER
Precise photometry from the Kepler space telescope allows not only the measurement of rotation in solar-type field stars, but also the determination of reliable masses and ages from asteroseismology. These critical data have recently provided the first opportunity to calibrate rotation-age relations for stars older than the Sun. The evolutionary picture that emerges is surprising: beyond middle-age the efficiency of magnetic braking is dramatically reduced, implying a fundamental change in angular momentum loss beyond a critical Rossby number ( Ro similar to 2). We compile published chromospheric activity measurements for the sample of Kepler asteroseismic targets that were used to establish the new rotation-age relations. We use these data along with a sample of well-characterized solar analogs from the Mount Wilson HK survey to develop a qualitative scenario connecting the evolution of chromospheric activity to a fundamental shift in the character of differential rotation. We conclude that the Sun may be in a transitional evolutionary phase, and that its magnetic cycle might represent a special case of stellar dynamo theory.
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