Progress in Physics of the Sun and Stars: A New Era in Helio- and Asteroseismology
Progress in Physics of the Sun and Stars: A New Era in Helio- and Asteroseismology
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太阳和恒星物理学的进展：日震学和星震学的新时代
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
T. J.
中科院分区：
文献类型：
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作者：
L. P.;T. A.;L. H.;D. J.;B. P.G.;B. S.;K. N.;D. A.;S. J.;T. P.;T. J.
乍一看，a型恒星KIC 5988140的开普勒数据模拟了一个重叠δ Scuti型短周期变异性的食双星系统的光曲线。开普勒星震学联盟（KASC）将其归因于“双星和多星”工作组，我们在那里发现了它。我们利用高质量的空间光度测量和最近的高分辨率光谱来研究这颗晚期a型天体变化的原因。我们考虑了三种不同的可能情况：(1)二元性；(2)γ Doradus和δ Scuti脉动共存（混合情况）；(3)恒星表面以不对称的强度分布旋转（即旋转调制）。我们证实了δ Scuti型存在多种压力模式。然而，前面的情景都不能再现所有观测到的变化特征。因此，剩余的光和径向速度变化的原因目前仍然无法解释任何考虑过的物理过程。
At first sight, the Kepler data of the A-type star KIC 5988140 mimics the light curve of an eclipsing binary system with a superposed short-period variability of type δ Scuti. It was attributed by the Kepler Asteroseismology Consortium (KASC) to the working group “Binary and Multiple Stars”, where we picked it up. We used the high-quality space photometry supplemented by recent high-resolution spectra to investigate the cause of the variability of this late A-type object. We considered three different possible scenarios: (1) binarity, (2) co-existence of γ Doradus and δ Scuti pulsations (the hybrid case) and (3) rotation of the stellar surface with an asymmetric intensity distribution (i.e. rotational modulation). We confirm the presence of various pressure modes of type δ Scuti. However, none of the previous scenarios is capable of reproducing all of the observed characteristics of the variations. Thus, the cause of the remaining light and radial velocity variations remains presently unexplained by any of the considered physical processes.