A Correlation on Stellar Flares detected with MAXI ∼ Quiescent Luminosity vs. Flare Energy ∼
Abstract
MAXI has detected more than a hundred of huge flares from twenty-seven active stars (RS CVn system, Algol system, dMe star, dKe star, Young Stellar Object and K-type variable star). The flare energies range from 6 × 10^{33} to 9 × 10^{39} in the 2-20 keV. All flares locate the high ends of their own categories (Tsuboi et al. 2016). We compare the largest X-ray flare energy in 7.25 years (running period of MAXI from 2009 August to 2016 December) (E_{tot,max}) with quiescent state X-ray luminosity (L_{x,q}) for each object. Each L_{x,q} is extracted from the 1RXS catalogue (Voges et al. 1999). As a result, we discover a correlation of E_{tot,max} ∝ L_{x,q}^{1.2}, for the first time. This correlation is consistent with a hypothesis that both flares and quiescent state X-ray emissions originate from magnetic activities. In addition, given the diversity of our stellar samples, we suggest that flare mechanisms are intrinsically the same among all the stellar flare systems. We will present our detailed interpretation of the intriguing correlation we found.
- Publication:
-
The X-ray Universe 2017
- Pub Date:
- October 2017
- Bibcode:
- 2017xru..conf..201S