Уровни корональной и хромосферной активности поздних звезд и различные типы динамо-волнстатья
Статья опубликована в журнале из списка RSCI Web of Science
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Статья опубликована в журнале из перечня ВАК
Дата последнего поиска статьи во внешних источниках: 28 июня 2018 г.
Аннотация:We analyze the X-ray emission and chromospheric activity of late-type F, G, and K stars studied in
the framework of the HK project. More powerful coronas are possessed by stars displaying irregular variations
of their chromospheric emission, while stars with cyclic activity are characterized by comparatively modest
X-ray luminosities and ratios of the X-ray to bolometric luminosity
LX/Lbol. This indicates that the nature of
processes associated with magnetic-field amplification in the convective envelope changes appreciably in the
transition from small to large dynamo numbers, directly affecting the character of the (α – Ω) dynamo. Due to
the strong dependence of both the dynamo number and the Rossby number on the speed of axial rotation, earlier
correlations found between various activity parameters and the Rossby number are consistent with our conclu-
sions. Our analysis makes it possible to draw the first firm conclusions about the place of solar activity among
analogous processes developing in active late-type stars.