Activity of Selected Solar Twins
M.M. Katsova, B.A. Nizamov, A.A. Shlyapnikov

TL;DR
This study investigates magnetic activity, rotation, and flares in 23 solar twins, revealing significant variability in their coronal activity, rotation rates, and flare energies, and exploring links to stellar age and magnetic phenomena.
Contribution
It provides a comprehensive analysis of magnetic activity and flares in solar twins, including rotation periods and flare energies, with new insights into their age and magnetic properties.
Findings
Wide scatter in X-ray to bolometric luminosity ratios among stars.
Detection of fast rotation periods around 6 days indicating youth.
Observation of large, long-duration stellar flares with energies up to 8×10^{33} erg.
Abstract
We analyze various tracers of magnetic activity for 23 solar twins which are characterized by significant scatter of lithium abundance in their atmospheres. A level of coronal and chromospheric activity has been studied from available X-ray and UV-archival data. It gives us a chance to compare coronae of solar twins of various ages with the solar case. We found a scatter in the X-ray to bolometric luminosity ratio by several orders of magnitude, which exists in these stars along with a significant spread in Li abundance. This may link the surface activity of stars with phenomena at the base of their convective zones. The TESS data allowed us to reveal rotation modulation of stellar brightness associated with starspots. For some twins of our samples, periods of axial rotation are detected around 6 days, i.e. these stars rotate almost 4 times faster than the contemporary…
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