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Spots and Activity of Solar-type Stars from Kepler Observationsстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Дата последнего поиска статьи во внешних источниках: 13 июня 2017 г.
- Авторы: Savanov I.S., Dmitrienko E.S.
- Журнал: Astronomy Reports, 2017, Vol. 61, No. 5, pp. 461–467
- Том: 61
- Номер: 5
- Год издания: 2017
- Первая страница: 461
- Последняя страница: 467
- DOI: 10.1134/S1063772917050067
- Аннотация: The spot coverages S for 2846 solar-type stars with effective temperatures from 5700 K to 5800 K and gravities from 4.4 to 4.5 have been measured. An analysis based on the MAST catalog, which presents photometricmeasurements obtained with the Kepler Space Telescope duringQ9 is presented. The existence of two groups of solar-type stars, with S values between 0.001 and 0.007 and withS > 0.007, is inferred. The second group (active stars) contains 279 stars (about 10 % of the total number of stars analyzed). The mean S parameter for the entire sample is 0.004, comparable to the mean spot coverage of the Sun. In general, the dependence of S on the rotation period for solar-type stars has characteristics similar to those found earlier for stars with exoplanets. For the vast majority of the stars in the sample, the activity is constant, and independent of age. The activity of the small number of active stars withS > 0.007 decreaseswith age. The age variations of the chromospheric activity index R_HK are compared to variations of the spot coverage S. The relations analyzed have common characteristic features. It is likely that both the spot activity level and the chromospheric activity level abruptly decrease for stars older than 4 billion yrs. DOI: 10.1134/S1063772917050067
- Добавил в систему: Дмитриенко Елена Сергеевна