Flare Activity and Magnetic Feature Analysis of the Flare Stars

TL;DR

This study investigates the relationship between magnetic features and flare activity in 1740 stars, revealing how magnetic coverage, contrast, and stability influence flare frequency and power across different stellar types.

Contribution

It provides a comprehensive analysis linking magnetic feature characteristics with flare activity across various star types, using an automated detection algorithm and light curve data.

Findings

Flare frequency and power increase with magnetic coverage and contrast in F-M stars.

Magnetic feature stability correlates with coverage and contrast, similar to solar behavior.

Magnetic activity and flare properties increase with decreasing Rossby number in G, K, M stars until saturation.

Abstract

We analyze the light curve of 1740 flare stars to study the relationship between the magnetic feature characteristics and the identified flare activity. Coverage and stability of magnetic features are inspired by rotational modulation of light curve variations and flare activity of stars are obtained using our automated flare detection algorithm. The results show that (i) Flare time occupation ratio (or flare frequency) and total power of flares increase by increasing relative magnetic feature coverage and contrast in F-M type stars (ii) Magnetic feature stability is highly correlated with the coverage and the contrast of the magnetic structures as this is the case for the Sun (iii) Stability, coverage and contrast of the magnetic features, time occupation ratio and total power of flares increases for G, K and M-type stars by decreasing Rossby number due to the excess of produced magnetic field from dynamo procedure until reaching to saturation level.