Characterisation of the hyperactive star HD 251108: Spectroscopic monitoring and discovery of optical superflares

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Table 5

Physical flare parameters of observed TESS flares.

Quantity	Flare 1	Flare 2	Flare 3a/b
Time of flare peak (TJD)	3244.30	3257.06	2204.92
Decay time (d)	1.19	0.39	0.56/0.50
Peak flare luminosity ^(a) (erg/s)	4.1 × 10³³	2.7 × 10³⁴	0.4/1.1 × 10³⁴
Total flare energy ^(a) (erg)	2.8 × 10³⁸	1.7 × 10³⁹	2.8/5.7 × 10³⁸
T_flare = 15 000 K Size^(a) (1000 km)	210	550	220/350
T_flare = 8000 K Size^(a) (1000 km)	750	1920	750/1230

Notes. ^(a) We estimate the error to be about a factor of 2, given the uncertainties in our assumptions.

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