Abstract
X‐ray observations of young stellar objects (YSOs) have shown several complex phenomena at work. In recent years, a few X‐ray programs based on long, continuous, and, sporadically, simultaneous coordinated multiwavelength observations have paved the way to our current understanding of the physical processes at work, which very likely regulates the interaction between the star and its circumstellar disk. We will present and discuss some recent results based on a novel analysis of a few selected very large flares observed with the Chandra Orion Ultradeep Pointing, on the systematic analysis of a large collection of flares observed with the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264) as well as on the Class I/II YSO Elias 29, in the rho Oph star forming region, whose data have been recently gathered as part of a joint simultaneous XMM‐Newton and NuSTAR large program.
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