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The corona -- chromosphere connection studied with simultaneous eROSITA and TIGRE observations by Fuhrmeister, B.; Robrade, J.; Gonzalez-Perez, J. N.; Schneider, C.; Mittag, M.; Schmitt, J. H. M. M. is a scholarly article available to read on EtoBox.

What is The corona -- chromosphere connection studied with simultaneous eROSITA and TIGRE observations about?

Stellar activity is inherently time variable, therefore simultaneous measurements are necessary to study the correlation between different activity indicators. In this study we compare X-ray fluxes measured within the first all-sky survey conducted by the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) instrument on board the Spectrum-Roentgen-Gamma (SRG) observatory to Ca II H & K, excess flux measurements R+, using observations made with the robotic TIGRE telescope. We created the largest sample of simultaneous X-ray and spectroscopic Ca II H & K observations of late-type stars obtained so far, and in addition, previous measurements of Ca II H & K for all sample stars were obtained. We find the expected correlation between our log(L_X/L_bol) to log(R+) measurements, but when the whole stellar ensemble is considered, the correlation between coronal and chromospheric activity indicators does not improve when the simultaneously measured data are used. A more detailed analysis shows that the correlation of log(L_X/L_bol) to log(R+) measurements of the pseudo-simultaneous data still has a high probability of being better than that of a random set of non-simultaneous

Author

Fuhrmeister, B.; Robrade, J.; Gonzalez-Perez, J. N.; Schneider, C.; Mittag, M.; Schmitt, J. H. M. M.

Published

2021

Language

EN