...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical Journal. Supplement Series >KOI-54: The Kepler discovery of tidally excited pulsations and brightenings in a highly eccentric binary
【24h】

KOI-54: The Kepler discovery of tidally excited pulsations and brightenings in a highly eccentric binary

机译：KOI-54：开普勒发现高偏心二元中的潮汐激发的脉动和增亮

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Kepler observations of the star HD 187091 (KIC 8112039, hereafter KOI-54) revealed a remarkable light curve exhibiting sharp periodic brightening events every 41.8 days with a superimposed set of oscillations forming a beating pattern in phase with the brightenings. Spectroscopic observations revealed that this is a binary star with a highly eccentric orbit, e = 0.83. We are able to match the Kepler light curve and radial velocities with a nearly face-on (i = 55) binary star model in which the brightening events are caused by tidal distortion and irradiation of nearly identical A stars during their close periastron passage. The two dominant oscillations in the light curve, responsible for the beating pattern, have frequencies that are the 91st and 90th harmonic of the orbital frequency. The power spectrum of the light curve, after removing the binary star brightening component, reveals a large number of pulsations, 30 of which have a signal-to-noise ratio ?7. Nearly all of these pulsations have frequencies that are either integer multiples of the orbital frequency or are tidally split multiples of the orbital frequency. This pattern of frequencies unambiguously establishes the pulsations as resonances between the dynamic tides at periastron and the free oscillation modes of one or both of the stars. KOI-54 is only the fourth star to show such a phenomenon and is by far the richest in terms of excited modes.
机译：开普勒对HD 187091号恒星（KIC 8112039，以下称KOI-54）的观测显示，每41.8天出现一条明显的光曲线，显示出尖锐的周期性增亮事件，并且叠加了一系列振荡，形成了与增亮相同的跳动模式。光谱观察表明，这是一个具有高度偏心轨道的双星，e = 0.83。我们能够将开普勒光曲线和径向速度与近乎面朝（i = 55）的双星模型相匹配，在该双星模型中，增亮事件是由潮汐畸变和近乎相同的A星在近地星体经过时的辐照引起的。光曲线中的两个主要振荡（构成跳动模式）的频率分别是轨道频率的第91次谐波和第90次谐波。去除双星增亮成分后，光曲线的功率谱显示出大量的脉动，其中30个脉动的信噪比为7。几乎所有这些脉动的频率要么是轨道频率的整数倍，要么是在理论上分裂为轨道频率的倍数。频率的这种模式明确地将脉动确立为围星体处的动态潮汐与其中一个或两个恒星的自由振荡模式之间的共振。 KOI-54只是出现这种现象的第四颗星，并且在激发模式方面是迄今为止最丰富的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号