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astro-ph.SR2025
The Sun as an X-ray star V.: A new method to retrieve coronal filling factors
Wilhelmina Maryann Joseph, Beate Stelzer, Salvatore Orlando +1
Context. Stellar coronae are unresolved in X-rays, so inferences about their structure rely on spectral analysis. The "Sun-as-an-X-ray-star" (SaXS) approach uses the Sun as a spati…
astro-ph.SR2024★ 7 cited
Simultaneous X-ray and optical variability of M dwarfs observed with eROSITA and TESS
W. M. Joseph, B. Stelzer, E. Magaudda +1
We study variability through simultaneous optical and X-ray observations for the first time in a statistical sample of 256 M dwarfs. Such observations are required to constrain the…