Unusual high-frequency oscillations in the Kepler δ Scuti star KIC 4840675
Unusual high-frequency oscillations in the Kepler δ Scuti star KIC 4840675
复制标题
开普勒 δ Scuti 星 KIC 4840675 中不寻常的高频振荡
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Martin C. Stumpe
中科院分区：
文献类型：
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作者：
L. Balona;M. Breger;G. Catanzaro;M. Cunha;G. Handler;Z. Kołaczkowski;D. Kurtz;S. Murphy;E. Niemczura;M. Paparó;B. Smalley;R. Szabó;K. Uytterhoeven;J. Christiansen;K. Uddin;Martin C. Stumpe
我们发现开普勒观测到的KIC-4840675恒星是由三颗恒星组成的，其中一颗是快速自转的A型恒星，另一颗是较暗的太阳恒星。A型恒星是一种δScuti变星，具有主导模式和许多其他较低幅度的模式，包括几个低频变化。最大幅度的低频变化可以解释为光曲线随时间变化的旋转调制。然而，这颗恒星最有趣的方面是在118-129d−1(1.4-1.5 MHz)范围内的三重独立模式，这远远超出了典型的δScuti频率范围。我们讨论了这些模式可能是类似太阳的振荡，roAp类型的振荡，或者是由于看不见的脉动致密伴星。
We show that the star KIC 4840675 observed by Kepler is composed of three stars with a rapidly rotating A-type star and two solar-type fainter companions. The A-type star is a δ Scuti variable with a dominant mode and many other modes of lower amplitude, including several low-frequency variations. The low-frequency variation with highest amplitude can be interpreted as rotational modulation with the light curve changing with time. However, the most interesting aspect of this star is a triplet of independent modes in the range 118–129 d −1 (1.4–1.5 mHz), which is far outside the range of typical δ Scuti frequencies. We discuss the possibility that these modes could be solar-like oscillations, oscillations of the roAp type or due to an unseen pulsating compact companion.