Astronomers uncover the engine behind the most powerful stellar flares in the Kepler field

Pioneering Study from Konkoly Observatory

A new study led by researchers at the Konkoly Observatory of the HUN-REN Research Centre for Astronomy and Earth Sciences (HUN-REN CSFK) in Budapest has shed light on a remarkable distant red giant star. The team successfully determined what makes this object the most explosively active star observed across the entire Kepler field.

Interplay of Starspots, Companion, and Dynamo

The research reveals that the extreme flare activity is driven by a subtle and powerful interaction within the system. The physical engine combines the gravitational presence of a close stellar companion, vast dark starspots spanning the giant's surface, and a highly efficient internal magnetic dynamo that continuously fuels massive energy releases.

Implications for Stellar Magnetic Evolution

These findings provide crucial insights into how magnetic dynamos function in evolved stars influenced by binary systems. By demonstrating how close companions and starspots drive stellar flares, the study helps refine theoretical models of magnetic field generation and explosive behavior in giant stars.