The Digital Press

This study examines the relationship between stellar coronal X-ray emissions and chromospheric Ca II infrared triplet (IRT) activity across over 40,000 stars using data from eROSITA and Gaia DR3. It reveals how this correlation varies by spectral type and stellar rotation rate, providing new insights into stellar activity patterns.

Why it matters: Understanding stellar activity correlations aids in characterizing star behaviors and their impacts on surrounding environments.

The big picture: Late-type stars show strong X-ray and Ca II IRT emission correlation; F-type stars demonstrate weaker links.

Stunning stat: Over 43,000 stars with reliable Ca II IRT and X-ray data form the largest sample studied so far.

Quick takeaway: Both X-ray and Ca II IRT activity saturate at similar rotation rates; X-ray flux declines faster in slower rotators.