Improved rotation-activity-age relations in Sun-like stars. Issue Volume 12:Issue S328(2016) (12th September 2017)

• Record Type: Journal Article
• Authors: Meléndez, Jorge; Santos, Leonardo A. dos; Freitas, Fabrício C.
• Editors: Nandy, D.; Valio, A.; Petit, P.
• Is Part Of: Proceedings of the International Astronomical Union. Volume 12:Issue S328(2016)
• Page Start: 274
• Page End: 281
• Publication Date: 2017-09-12
• Subjects: Sun: activity, -- Sun: rotation, -- stars: activity, -- stars: rotation, -- techniques: spectroscopic; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921317004203
• Languages: English
• ISSNs: 1743-9213

Abstract

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.