Flares of M-stars in Upper Scorpius region and flares and CMEs of the active M-star AD Leo

Flares of M-stars in Upper Scorpius region and flares and CMEs of the active M-star AD Leo

Using the Kepler K2 data, we studied the flare-activity of young K-and M-stars in the Upper Sco region and found that they have 10000 to 80000 times as many super-flares with E> 5E34 erg than solar like stars. The power-law index for flares is $N/dE~E^-1.2 for K stars, N/dE~E^-1.4 for early M-sta...

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Veröffentlicht in:arXiv.org 2019-11
Hauptverfasser: Guenther, E W, Woeckel, D, Muheki, P
Format: Artikel
Sprache:eng
Schlagworte:
Coronal mass ejection
K stars
M stars
Stellar flares
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Zusammenfassung:Using the Kepler K2 data, we studied the flare-activity of young K-and M-stars in the Upper Sco region and found that they have 10000 to 80000 times as many super-flares with E> 5E34 erg than solar like stars. The power-law index for flares is $N/dE~E^-1.2 for K stars, N/dE~E^-1.4 for early M-star and dN/dE~E^-1.3 for late M stars, which is about the same as that of the Sun. We also observed the active M-star AD Leo spectroscopy for 222 hours, detected 22 flares but no coronal mass ejections.
ISSN:2331-8422