Rotation and magnetism of Kepler pulsating solar-like stars Towards asteroseismically calibrated age-rotation relations

• Published in: Astronomy and astrophysics (Berlin) Vol. 572; pp. 1 - 15
• Main Authors: Garcia, R A, Ceillier, T, Salabert, D, Mathur, S, van Saders, J L, Pinsonneault, M, Ballot, J, Beck, P G, Bloemen, S, Campante, T L
• Format: Journal Article
• Language: English
• Published: EDP Sciences 01.12.2014
• Subjects: Age; Astronomy; Astrophysics; Calibration; Metallicity; Photometry; Physics; Pulsation; Stars; Surface chemistry; asteroseismology; stars: solar-type; stars: oscillations; stars: activity; stars: evolution; stars: rotation
• ISSN: 0004-6361; 1432-0746; 1432-0756
• DOI: 10.1051/0004-6361/201423888

Kepler ultra-high precision photometry of long and continuous observations provides a unique dataset in which surface rotation and variability can be studied for thousands of stars. Because many of these old field stars also have independently measured asteroseismic ages, measurements of rotation and activity are particularly interesting in the context of age-rotation-activity relations. We study the surface rotation and photometric magnetic activity of a subset of 540 solar-like stars on the main-sequence and the subgiant branch for which stellar pulsations have been measured. The photometric magnetic activity levels of these stars were computed, and for 61.5% of the dwarfs, this level is similar to the range, from minimum to maximum, of the solar magnetic activity. We demonstrate that hot dwarfs, cool dwarfs, and subgiants have very different rotation-age relationships, highlighting the importance of separating out distinct populations when interpreting stellar rotation periods. Our sample of cool dwarf stars with age and metallicity data of the highest quality is consistent with gyrochronology relations reported in the literature.