Further evidence for a sub-year magnetic chromospheric activity cycle and activity phase jumps in the planet host τ Boötis
Further evidence for a sub-year magnetic chromospheric activity cycle and activity phase jumps in the planet host τ Boötis
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进一步证据表明,主行星Ï Boâtis存在亚年磁色球活动周期和活动相跳跃
DOI:
10.1051/0004-6361/201629429
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发表时间:
2017
影响因子:
6.5
通讯作者:
Mittag
中科院分区:
文献类型:
--
作者:
Schmitt;J. H. M. M;Mittag
We examine the S-index data, obtained in the context of the Mount Wilson H&K project for the nearby F-type starτBoo, for the presence of possible cyclic variations on timescales below one year and “phase jump” episodes in the observed S-index activity levels, to determine whether such features are persistent properties of the chromospheric activity ofτBoo and possibly other late-type stars. Within the Mount Wilson H&K projectτBoo was observed during 1278 individual nights, albeit with a very inhomogeneous coverage ranging from 2 to 137 observations per year. Our analysis shows that periodical variations with timescales on the order of 110–120 days are a persistent feature of the Mount Wilson data set. Furthermore we provide further examples of “phase jump” episodes, when the observed S-index activity drops from maximum to minimum levels on timescales of one to two weeks, hence such features also appear to occur on a more or less regular basis inτBoo.
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DOI:
10.1086/527351
发表时间:
2007-10
期刊:
The Astrophysical Journal
影响因子:
--
作者:
E. Shkolnik;D. Bohlender;G. Walker;A. Collier Cameron
通讯作者:
E. Shkolnik;D. Bohlender;G. Walker;A. Collier Cameron
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:
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
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
R. Fares;J. Donati;C. Moutou;D. Bohlender;C. Català;M. Deleuil;E. Shkolnik;A. Cameron;M. Jardine;Gordon A. H. Walker
通讯作者:
Gordon A. H. Walker
影响因子:
4.8
作者:
R. Fares;C. Moutou;J. Donati;C. Català;E. Shkolnik;M. Jardine;A. Cameron;M. Deleuil
通讯作者:
M. Deleuil