在剑鱼座γ星中以前看不见的脉动频率的SMEI观测
SMEI observations of previously unseen pulsation frequencies in gamma Doradus
摘要：
目标：作为g模式的转换器，γ剑鱼座类恒星可能会天真地被期望显示出大量的模式。利用太阳质量抛射成像仪（SMEI）仪器产生的长时间测光时间序列，我们研究了星伽马剑鱼座，以确定是否有任何其他模式比三个已知的存在可观察的振幅。研究方法：采用PERIOD04软件包对2003年4月至2006年3月期间从SMEI采集的高精度光度数据进行周期图分析。结果：我们确定了三个额外的频率，分别为每天1.39、1.87和2.743个周期。这些都超过了已知的频率1.320，1.364，和1.47周期每天。结论：两个新的频率，在1.39和1.87周期每天，推测是额外的振荡模式，与第三个频率在2.743周期每天一个可能的组合频率。
英文摘要：
Aims: As g-mode pulsators, gamma-Doradus-class stars may naively be expected to show a large number of modes. Taking advantage of the long photometric time-series generated by the Solar Mass Ejection Imager (SMEI) instrument, we have studied the star gamma Doradus to determine whether any other modes than the three already known are present at observable amplitude. Methods: High-precision photometric data from SMEI taken between April 2003 and March 2006 were subjected to periodogram analysis with the PERIOD04 package. Results: We confidently determine three additional frequencies at 1.39, 1.87, and 2.743 cycles per day. These are above and beyond the known frequencies of 1.320, 1.364, and 1.47 cycles per day. Conclusions: Two of the new frequencies, at 1.39 and 1.87 cycles per day, are speculated to be additional modes of oscillation, with the third frequency at 2.743 cycles per day a possible combination frequency.
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