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

Published online by Cambridge University Press:  12 September 2017

Jorge Meléndez
Affiliation:
Universidade de São Paulo, IAG, Departamento de Astronomia Rua do Matão 1226, 05508-090 São Paulo, SP, Brazil email: jorge.melendez@iag.usp.br
Leonardo A. dos Santos
Affiliation:
Universidade de São Paulo, IAG, Departamento de Astronomia Rua do Matão 1226, 05508-090 São Paulo, SP, Brazil email: jorge.melendez@iag.usp.br
Fabrício C. Freitas
Affiliation:
Universidade de São Paulo, IAG, Departamento de Astronomia Rua do Matão 1226, 05508-090 São Paulo, SP, Brazil email: jorge.melendez@iag.usp.br
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Abstract

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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

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