论文标题
部分可观测时空混沌系统的无模型预测
Long Secondary Periods in Pulsating Red Giants: A Century of Investigation
论文作者
论文摘要
红色巨人对径向搏动不稳定。其中大约三分之一还显示了较长的次要时期，是脉动期的5至10倍。漫长的第二个时期最近被低质量的尘埃刺激的同伴归因于红色巨人的日食。长时间的中期已有一个多世纪以来。在本文中，我主要使用美国可变星观测者协会的视觉和光电观察协会来寻找1963年南希·霍克（Nancy Houk）在1963年列出的103个红色巨星中长期二级时期的证据，这主要是基于照相光度法。我已经确定了37颗恒星中的长期二级时期，上限（其中一些不是很严格）。宽松的中期与37颗恒星中33颗O0F Houk一致。我已经将16颗恒星确定为双峰脉冲运动；它们的周期比与以前的观察结果和理论结果一致。对于14颗恒星，可变恒星一般目录中的周期是不正确或不正确的。
Red giants are unstable to radial pulsation. About a third of them also show a long secondary period, 5 to 10 times the pulsation period. The long secondary periods were recently ascribed to eclipses of the red giant by a low-mass dust-enshrouded companion. Long secondary periods have been known for over a century. In this paper, I use primarily American Association of Variable Star Observers visual and photoelectric observations to look for evidence of long secondary periods in 103 red giant stars listed by Nancy Houk in 1963 as having long secondary periods, based mostly on photographic photometry. I have determined long secondary periods in 37 stars, and upper limits (some of them not very stringent) in 25. In the former, the ratio of long secondary period to pulsation period peaks strongly at 10, which suggests that most of the stars are pulsating in the first overtone. The loong secondary periods are consistent with those o0f Houk in 33 of the 37 stars. I have identified 16 stars as bimodal pulsaters;their period ratios are consistent with previous observational and theoretical results. For 14 stars,the periods in the General Catalogue of Variable Stars are incorrect or absent.
