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Starspots and Activity of the Flare Star GJ 1243статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
- Авторы: Savanov I.S., Dmitrienko E.S.
- Журнал: Astronomy Reports
- Том: 62
- Номер: 4
- Год издания: 2018
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 273
- Последняя страница: 280
- DOI: 10.1134/S1063772918040066
- Аннотация: The photometric variability of the unique M dwarf flare star GJ 1243 (KIC 9726699) is investigated using the most complete set of observational material obtained with the Kepler Space Telescope. The analysis is based on 49487 individual brightness measurements obtained during an interval of 1460 days (nearly four years). The periodicity of the brightness variations with the period Pphot = 0.59261± 0.00060d is confirmed. The temperature inhomogeneities on the stellar surface reconstructed from the light curve are used to drive maps of these surface-temperature inhomogeneities (of the filling factor f). The resulting maps are used to determine the positions of active regions. Analysis of the surface-temperature maps for GJ 1243 led to the conclusion that the positions of spots on the stellar surface displayed appreciable evolution during the analyzed time interval. The maximum value for the lower limit on the differential rotation parameter ΔΩ is 0.0022 rad/day. This more accurate estimate of ΔΩ is lower than the values presented earlier by Davenport et al. [1] (0.0058 and 0.0036 day/day), due to the more accurate account of variations in the positions of the most active longitude in the current study. However, the differential rotation estimate obtained in [1] using a method based on fitting the evolution of spots using two dimensional Gaussian functions essentially coincides with the new estimate presented here. The fractional area of the total spotted surface S of the star during the observing interval considered varied from 7 to 2%. The amplitude of the brightness variability of the star slowly decreased, varying in the range 1.6−0.5%. Overall, the position of GJ 1243 in spottedness–age, spottedness–rotation period, and spottedness–Rossby number diagrams agrees very well with the general character of the dependences displayed in earlier studies of M dwarfs.
- Добавил в систему: Дмитриенко Елена Сергеевна