2025ApJ...992...49W

We present XMM-Newton observations and near-simultaneous optical observations of the classical T Tauri star SU Auriga and the nearby Herbig Ae star AB Auriga, two members of the 4 Myr old Taurus-Auriga star-forming region. Combining these observations with archival ones, we examine data covering more than two decades, aiming to determine the X-ray stability of these two stars over that period. We model the X-ray spectra for each star using XSPEC models and present the results of this modeling. For SU Aur, we find evidence for absorption by both the stellar corona and an accretion column, supported by both the best-fit model to the X-ray spectra and the variable, self-absorbed Hα profile observed in the optical. We observe a single flare at the end of the observing period for SU Aur.