Discovery of short-term activity cycles in F-type stars
Discovery of short-term activity cycles in F-type stars
复制标题
F型恒星短期活动周期的发现
DOI:
10.1051/0004-6361/201834319
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发表时间:
2019
影响因子:
6.5
通讯作者:
Schröder
中科院分区:
文献类型:
--
作者:
Mittag;Schmitt;J. H. M. M;Hempelmann;Schröder
Previous studies have revealed a 120 day activity cycle in the F-type starτBoo, which represents the shortest activity cycle discovered until now. The question arises as to whether or not short-term activity cycles are a common phenomenon in F-type stars. To address this question, we analyseS-index time series of F-type stars taken with the TIGRE telescope to search for periodic variations with a maximal length of 2 years using the generalised Lomb-Scargle periodogram method. In our sample, we find four F-type stars showing periodic variations shorter than one year. However, the amplitude of these variations in our sample of F-star type stars appears to be smaller than that of solar-type stars with well-developed cyclic activity, and apparently represents only a part of the total activity. We conclude that among F-stars, the time-behaviour of activity differs from that of the Sun and cooler main sequence stars, as short-term cyclic variations with shallow amplitude of the cycle seem to prevail, rather than cycles with 10+ years periods and a larger cycle amplitude.
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影响因子:
1.4
作者:
M. Mittag;A. Hempelmann;J. González-Pérez;J. Schmitt
通讯作者:
M. Mittag;A. Hempelmann;J. González-Pérez;J. Schmitt
影响因子:
6.5
作者:
Mittag;M.Robrade;Schmitt;J. H. M. M;Hempelmann;Gonzalez-Perez;Schröder;K. -P.
通讯作者:
K. -P.
影响因子:
6.5
作者:
A. Hempelmann;M. Mittag;J. González-Pérez;J. Schmitt;K. Schröder;G. Rauw
通讯作者:
A. Hempelmann;M. Mittag;J. González-Pérez;J. Schmitt;K. Schröder;G. Rauw
影响因子:
4.8
作者:
M. Mengel;R. Fares;S. Marsden;B. Carter;S. Jeffers;P. Petit;J. Donati;C. Folsom;the Bcool Collaboration
通讯作者:
the Bcool Collaboration
影响因子:
6.5
作者:
Schmitt;J. H. M. M;Mittag
通讯作者:
Mittag