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Improved rotation-activity-age relations in Sun-like stars

  • Jorge Meléndez (a1), Leonardo A. dos Santos (a1) and Fabrício C. Freitas (a1)

Abstract

The evolution of rotational velocity and magnetic activity with age follows approximately a t −1/2 relation, the famous Skumanich law. Using a large sample of about 80 solar twins with precise ages, we show departures from this law. We found a steep drop in rotational velocity and activity in the first 2-3 Gyr and afterwards there seems to be a shallow decrease. Our inferred rotational periods suggest that the Sun will continue to slow down, validating thus the use of gyrochronology beyond solar age. The Sun displays normal rotational velocity and activity when compared to solar twins of solar age. We also show that stars with exceedingly high stellar activity for their age are spectroscopic binaries that also exhibit enhanced rotational velocities and chemical signatures of mass transfer.

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