Kavli Affiliate: Jing Wang
| First 5 Authors: Jian-Ying Bai, Jing Wang, Hua-Li Li, Li-Ping Xin, Guang-Wei Li
| Summary:
We observed active M dwarf star AD Leo for 146 hr in photometry by GWAC-F30
and also analyzed 528-hr photometric data of the star from TESS. A total of 9
and 70 flares are detected from GWAC-F30 and TESS, respectively. Flare
durations, amplitudes and energies are calculated. The distributions of the
three properties and FFDs are given. Within the same energy range of flares,
the FFDs of AD Leo obtained in this research and the previous study are
basically consistent, which suggests that the magnetic activity of this star
has not significantly changed compared to that decades ago. Comparing with the
average FFD of M-type stars, AD Leo’s FFD is twice higher, indicating that its
magnetic activity is more active than that of the average level of the M-type.
Based on TESS light curve, AD Leo’s rotation period is calculated as
2.21${+0.01 choose -0.01}$ day , supporting the result given in previous
research. During the decay phase of the most energetic flare from TESS, we
identified QPPs and determined a 26.5-min oscillation period, which is
currently the longest period for AD Leo, suggesting that long periodic physical
process existed during flare of this star.
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