eROSITA has unleashed a deluge of observations of the stellar X-ray sky in a nexus with other powerful complementary capabilities, such as TESS and Gaia. At the same time, a feeding frenzy of the exoplanet field hungry for data on planetary energetic radiation environments has driven a renaissance of interest and research into stellar coronae and what used to be the backwater of high energy...
The eROSITA all-sky survey (eRASS) largely increased the number of well-characterized X-ray detected stars.
I will present our method, called HamStar, to identify these stars among all eROSITA sources. HamStar assigns
each eROSITA source a value, p_stellar, that describes the individual probability of the source to be stellar
in nature. HamStar uses a Bayesian-framework taking advantage...
The solar corona is often invoked as a template for stellar ones, but the significant difference between solar and non-solar instruments and data makes direct comparison between X-ray observations of the Sun, which is usually of the resolved solar disk, and stellar point-source observations almost impossible. In order to overcome this hurdle, the research group at INAF Osservatorio Astronomico...
