MinimumCorona

Vermessung der minimalen Korona-Aktivität von Sternen

01.03.2025 bis 30.09.2027

Stars of late spectral type, including our Sun, emit high-energy photons (in the UV and X-ray range) from their outer atmospheres. This radiation characterizes the stellar dynamo and determines the evolution of exoplanets. To better understand this, the whole range of magnetically active behavior must be measured, from superflares to coronal holes.
The present project is based on two new observing programs with the XMM-Newton X-ray observatory which pursue different approaches with the aim of determining the minimum X-ray brightness of magnetically active stars and the abundance of such extremely faint stars.