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Title: A STUDY OF VARIABILITY IN THE FREQUENCY DISTRIBUTIONS OF THE SUPERFLARES OF G-TYPE STARS OBSERVED BY THE KEPLER MISSION

The energy and time profiles of 4944 superflares from 77 G-type stars with well-defined light curve periodicities from the Kepler measurements have been analyzed in detail. The total value of the power-law index of the flare frequency distribution as a function of energy (dN/dE ∝ E {sup –γ}) between 5 × 10{sup 34} and 10{sup 36} erg is on average γ = 2.04 ± 0.17, which is in agreement with previous results. The γ values of eight stars with frequent flaring activity vary between 1.59 ± 0.06 and 2.11 ± 0.19, suggesting a possible diversity of energy release effects. In general, stars with shorter rotation periods tend to have larger γ values. There is an indication that the flare energy is saturated at about 2 × 10{sup 37} erg. For a few large superflares of this energy range, it is found that their temporal behaviors could be characterized by a transition from single impulsive flares to long-duration flares composed of several flares.
Authors:
;  [1] ;  [2]
  1. Graduate Institute of Space Science, National Central University, Taoyuan 32001, Taiwan (China)
  2. Institute of Astronomy, National Central University, Taoyuan 32001, Taiwan (China)
Publication Date:
OSTI Identifier:
22364644
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 798; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DIAGRAMS; ENERGY DEPENDENCE; INDEXES; ROTATION; STARS; STATISTICS; STELLAR FLARES; VISIBLE RADIATION