TL;DR
Recent X-ray observations with Chandra and XMM-Newton have significantly advanced our understanding of hot plasma processes in stars, revealing detailed spectral diagnostics and addressing longstanding questions about stellar activity and high-energy phenomena.
Contribution
This paper reviews recent progress in understanding stellar X-ray emission processes enabled by high-quality spectra from Chandra and XMM-Newton, highlighting new insights into stellar activity and plasma physics.
Findings
Detailed spectral diagnostics of stellar X-ray emission.
Insights into stellar activity cycles and plasma structuring.
Understanding of X-ray generation mechanisms like accretion and jets.
Abstract
A decade of X-ray stellar observations with Chandra and XMM-Newton has led to significant advances in our understanding of the physical processes at work in hot (magnetized) plasmas in stars and their immediate environment, providing new perspectives and challenges, and in turn the need for improved models. The wealth of high-quality stellar spectra has allowed us to investigate, in detail, the characteristics of the X-ray emission across the HR diagram. Progress has been made in addressing issues ranging from classical stellar activity in stars with solar-like dynamos (such as flares, activity cycles, spatial and thermal structuring of the X-ray emitting plasma, evolution of X-ray activity with age), to X-ray generating processes (e.g. accretion, jets, magnetically confined winds) that were poorly understood in the pre-Chandra/XMM-Newton era. I discuss the progress made in the study of…
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