Nearby Sun-like stars are prime targets for the detection and characterization of exoplanets and possibly exo-earths. Understanding their formation history and determining the age of these stars (and their planetary systems) is thus essential. The present study address es the formation history of solar-type stars using the emission reversal in the core of their CaII H and K Fraunhofer lines as an age indicator.

{"references": ["Gomes da Silva et al. 2021, A&A, 646, A&&", "Gondoin, 2020, A&A, 641, A110", "Ruiz-Lara et al. 2020, Nat. Astron. 4, 965"]}