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• W2904584910 abstract "The presence and strength of a stellar magnetic field and activity is rooted in a star's fundamental parameters such as mass and age. Can flares serve as an accurate stellar clock? To explore if we can quantify an activity-age relation in the form of a flaring-age relation, we measured trends in the flaring rates and energies for stars with different masses and ages. We investigated the time-domain photometry provided by Kepler's follow-up mission K2 and searched for flares in three solar metallicity open clusters with well-known ages, M45 (0.125 Gyr), M44 (0.63 Gyr), and M67 (4.3 Gyr). We updated and employed the automated flare finding and analysis pipeline Appaloosa, originally designed for Kepler. We introduced a synthetic flare injection and recovery subroutine to ascribe detection and energy recovery rates for flares in a broad energy range for each light curve. We collected a sample of 1 761 stars, mostly late-K to mid-M dwarfs and found 751 flare candidates with energies ranging from $4cdot10^{32}$ erg to $6cdot10^{34}$ erg, of which 596 belong to M45, 155 to M44, and none to M67. We find that flaring activity depends both on $T_mathrm{eff}$, and age. But all flare frequency distributions have similar slopes with $alpha approx2.0-2.4$, supporting a universal flare generation process. We discuss implications for the physical conditions under which flares occur, and how the sample's metallicity and multiplicity affect our results." @default.
• W2904584910 created "2018-12-22" @default.
• W2904584910 creator A5008865065 @default.
• W2904584910 creator A5060798996 @default.
• W2904584910 creator A5076114528 @default.
• W2904584910 creator A5090455120 @default.
• W2904584910 date "2018-12-17" @default.
• W2904584910 modified "2023-09-27" @default.
• W2904584910 title "Flares in Open Clusters with K2. I. M45 (Pleiades), M44 (Praesepe) and M67" @default.
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