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Activity of Solar Twinsтезисы доклада Тезисы
- Авторы: Katsova Maria, Nizamov Bulat, Shlyapnikov Aleksey, Mishenina Tamara
- Сборник: 44th COSPAR Scientific Assembly
- Тезисы
- Год издания: 2022
- Место издания: COSPAR Athena
- Номер статьи: D1.2-0061-22
- Аннотация: We analyze data for 55 solar analogs which are characterized by significant scatter of lithium abundance in their atmospheres. Among these stars there are 22 solar twins. Preliminary analysis of the TESS mission data allowed us to reveal rotation modulation of stellar brightness associated with starspots. For some of our samples, periods of axial rotation are detected from 4.6 to 6.5 days, i.e. these stars rotate 4-6 times faster than the contemporary Sun. This indicates their relative youth. Flare activity of solar twins is discovered in the TESS data, and we present temporal profiles for different kinds of optical flares. A search available data in UV- and X-ray archives gives us a chance to compare coronae of the Sun and its twins of various ages. We found a scatter in the X-ray to bolometric luminosity ratio LX/Lbol by several orders of magnitude, which exists in these stars along with a significant scatter in the abundance of lithium. This may link the surface activity of solar mass stars with phenomena at the base of their convective zones. We note also that several stars in this sample are hosts one or more exoplanets. Acknowledgements MK, BN and AS acknowledge the support of Ministry of Science and Higher Education of the Russian Federation under the grant 075-15-2020-780.
- Добавил в систему: Кацова Мария Михайловна