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

Published online by Cambridge University Press:  12 September 2017

Jorge Meléndez Open the ORCID record for Jorge Meléndez [Opens in a new window] ,
Leonardo A. dos Santos  and
Fabrício C. Freitas
Jorge Meléndez
Affiliation:
Universidade de São Paulo, IAG, Departamento de Astronomia Rua do Matão 1226, 05508-090 São Paulo, SP, Brazil email: [email protected]
Leonardo A. dos Santos
Affiliation:
Universidade de São Paulo, IAG, Departamento de Astronomia Rua do Matão 1226, 05508-090 São Paulo, SP, Brazil email: [email protected]
Fabrício C. Freitas
Affiliation:
Universidade de São Paulo, IAG, Departamento de Astronomia Rua do Matão 1226, 05508-090 São Paulo, SP, Brazil email: [email protected]
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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.

Keywords

Sun: activitySun: rotationstars: activitystars: rotationtechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 274 - 281
Copyright
Copyright © International Astronomical Union 2017 

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