Stellar magnetic activity and variability of oscillation parameters: An investigation of 24 solar-like stars observed by Kepler
Stellar magnetic activity and variability of oscillation parameters: An investigation of 24 solar-like stars observed by Kepler
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恒星磁活动和振荡参数的变化：对开普勒观测到的 24 颗类太阳恒星的研究
DOI：
10.1051/0004-6361/201628469
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发表时间：
2016
影响因子：
6.5
通讯作者：
M. Roth
中科院分区：
文献类型：
--
作者：
R. Kiefer;A. Schad;G. Davies;M. Roth
上下文。太阳和类太阳恒星经历活动周期，其潜在机制尚不清楚。众所周知，太阳的振荡随其活动周期而变化，这些变化为光球层以下的情况提供了诊断。开普勒已经在数百颗恒星中发现了类似太阳的振荡，但到目前为止，还没有报道在这些恒星的振荡参数中广泛检测到磁活动周期的特征。目标。我们分析了一组24颗类太阳恒星的光度短节奏开普勒时间序列，每颗恒星至少观测了960天，目的是在振荡参数中找到恒星磁活动的特征。方法。我们通过测量模频移、p模包络高度的变化以及粒化时间尺度来分析振荡参数的时间演变。结果。在被调查的24颗恒星中，有23颗我们发现了明显的时间频移。我们提供了其中六颗恒星有磁场活动的证据。我们发现频移的幅度随恒星年龄和自转周期的增加而减小。对于KIC 8006161（最突出的例子），我们发现频率漂移在p模频率最低时最小，在p模频率最高时最大，就像太阳一样。结论。这些发现表明，在类太阳恒星的振荡参数中可以常规地观察到磁活动，这为通过星震学将太阳活动周期置于其他恒星的背景下提供了可能性。
Context. The Sun and solar-like stars undergo activity cycles for which the underlying mechanisms are not well understood. The oscillations of the Sun are known to vary with its activity cycle and these changes provide diagnostics on the conditions below the photosphere. Kepler has detected solar-like oscillations in hundreds of stars but as of yet, no widespread detection of signatures of magnetic activity cycles in the oscillation parameters of these stars have been reported. Aims. We analysed the photometric short cadence Kepler time series of a set of 24 solar-like stars, which were observed for at least 960 d each, with the aim to find signatures of stellar magnetic activity in the oscillation parameters. Methods. We analyse the temporal evolution of oscillation parameters by measuring mode frequency shifts, changes in the height of the p -mode envelope, as well as granulation timescales. Results. For 23 of the 24 investigated stars, we find significant frequency shifts in time. We present evidence for magnetic activity in six of these stars. We find that the amplitude of the frequency shifts decreases with stellar age and rotation period. For KIC 8006161 (the most prominent example), we find that frequency shifts are smallest for the lowest and largest for the highest p -mode frequencies, as they are for the Sun. Conclusions. These findings show that magnetic activity can be routinely observed in the oscillation parameters for solar-like stars, which opens up the possibility of placing the solar activity cycle in the context of other stars by asteroseismology.
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影响因子：
6.5
作者：
T. Kallinger;J. Ridder;S. Hekker;S. Mathur;S. Mathur;B. Mosser;M. Gruberbauer;M. Gruberbauer;R. García;C. Karoff;J. Ballot;J. Ballot
通讯作者：
T. Kallinger;J. Ridder;S. Hekker;S. Mathur;S. Mathur;B. Mosser;M. Gruberbauer;M. Gruberbauer;R. García;C. Karoff;J. Ballot;J. Ballot
DOI：
10.1088/0004-637x/749/2/152
发表时间：
2012-02
期刊：
The Astrophysical Journal
影响因子：
--
作者：
S. Mathur;T. Metcalfe;M. Woitaszek;H. Bruntt;G. Verner;J. Christensen-Dalsgaard;J. Christensen-Dalsgaard;O. Creevey;G. Doğan;G. Doğan;S. Basu;C. Karoff;C. Karoff;D. Stello;T. Appourchaux;T. Campante;T. Campante;W. Chaplin;R. García;T. Bedding;O. Benomar;A. Bonanno;S. Deheuvels;Y. Elsworth;P. Gaulme;J. Guzik;R. Handberg;S. Hekker;S. Hekker;W. Herzberg;M. Monteiro;L. Piau;P. Quirion;C. Régulo;C. Régulo;M. Roth;D. Salabert;A. Serenelli;Michael Thompson;R. Trampedach;T. White;J. Ballot;I. Brandao;J. Molenda–Żakowicz;H. Kjeldsen;J. Twicken;K. Uddin;B. Wohler
通讯作者：
S. Mathur;T. Metcalfe;M. Woitaszek;H. Bruntt;G. Verner;J. Christensen-Dalsgaard;J. Christensen-Dalsgaard;O. Creevey;G. Doğan;G. Doğan;S. Basu;C. Karoff;C. Karoff;D. Stello;T. Appourchaux;T. Campante;T. Campante;W. Chaplin;R. García;T. Bedding;O. Benomar;A. Bonanno;S. Deheuvels;Y. Elsworth;P. Gaulme;J. Guzik;R. Handberg;S. Hekker;S. Hekker;W. Herzberg;M. Monteiro;L. Piau;P. Quirion;C. Régulo;C. Régulo;M. Roth;D. Salabert;A. Serenelli;Michael Thompson;R. Trampedach;T. White;J. Ballot;I. Brandao;J. Molenda–Żakowicz;H. Kjeldsen;J. Twicken;K. Uddin;B. Wohler
影响因子：
6.5
作者：
T. Appourchaux;W. Chaplin;R. García;M. Gruberbauer;G. Verner;H. M. Antia;O. Benomar;T. Campante;G. Davies;S. Deheuvels;R. Handberg;S. Hekker;R. Howe;C. R'egulo;D. Salabert;T. Bedding;T. White;J. Ballot;S. Mathur;V. S. Aguirre;Y. Elsworth;S. Basu;R. Gilliland;J. Christensen-Dalsgaard;H. Kjeldsen;K. Uddin;Martin C. Stumpe;T. Barclay
通讯作者：
T. Appourchaux;W. Chaplin;R. García;M. Gruberbauer;G. Verner;H. M. Antia;O. Benomar;T. Campante;G. Davies;S. Deheuvels;R. Handberg;S. Hekker;R. Howe;C. R'egulo;D. Salabert;T. Bedding;T. White;J. Ballot;S. Mathur;V. S. Aguirre;Y. Elsworth;S. Basu;R. Gilliland;J. Christensen-Dalsgaard;H. Kjeldsen;K. Uddin;Martin C. Stumpe;T. Barclay
主序星近地表对流的三维模拟II 粒化和谱线特性
影响因子：
6.5
作者：
Cameron;Reiners;Schüssler
通讯作者：
Schüssler
太阳磁层变薄：可以预测特殊的太阳极小值
DOI：
10.1088/0004-637x/758/1/43
发表时间：
2012
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Basu S
通讯作者：
Basu S