论文标题
KIC〜8975515：具有rossby模式的快速旋转（$γ$ dor-$δ$ sct）和较慢的$Δ$ sct伴侣
KIC~8975515: a fast-rotating ($γ$ Dor - $δ$ Sct) hybrid star with Rossby modes and a slower $δ$ Sct companion in a long-period orbit
论文作者
论文摘要
{KIC 〜8975515是带有混合脉动的双线光谱二进制系统。两个组件具有相似的大气特性（t $ _ {\ rm eff} $ $ \ sim $ 7400〜K），其中一个是快速旋转器（$ v \ sin i = 162 $对32 km/s）。我们的目的是详细研究\ emph {kepler}光曲线，以确定脉动的频率，以在傅立叶频谱（如果有的话）中搜索常规间距模式，并在二进制性和快速旋转的背景下讨论它们的起源。在本文中，我们基于在傅立叶光谱的低，中间和高频区域进行的仔细分析研究了恒星脉动的特性。这是通过对频谱中所有显着频率进行连续的预先捕捉的重复搜索分析来完成的。此外，我们搜索了$ g $模式之间的常规间隔，以及$ g $和$ p $模式之间的频率分裂。在低频制度中，检测到了五种常规时期间距模式，包括一系列的Prograde $ G $模式和四个系列逆行$ R $模式。相对于快速旋转星的旋转频率$ f _ {\ rm rot} $ = 1.647 d $^{ - 1} $，$ r $模式与旋转频率的谐波相对于旋转频率的谐波进行了很好的分布。主要的$ g $模式为$ f_ {2} $ = 2.37 d $^{ - 1} $。最强的P模式，$ f_ {1} $ = 13.97 d $^{ - 1} $，形成单元。在高频区域中，我们确定了两个定期拆分$ p $模式的多重频率间距为0.42 d $^{ - 1} $和1.65 d $^{ - 1} $。我们检测到了一些系列逆行$ r $和PROGRADE $ G $模式以及两个$ P $模式的多个频率间隔，这些频率间距与Twin System KIC 〜8975515的两个组件的出色旋转相关。我们将快速旋转的组件确定为具有$ r $模式的混合脉动脉动，并且缓慢旋转的组件是$δ$ sct脉动器。
{KIC~8975515 is a \emph{Kepler} double-lined spectroscopic binary system with hybrid pulsations. Two components have similar atmospheric properties (T$_{\rm eff}$ $\sim$ 7400~K), and one of them is a fast rotator ($v\sin i = 162$ versus 32 km/s). Our aim is to study the \emph {Kepler} light curve in great detail in order to determine the frequencies of the pulsations, to search for regular spacing patterns in the Fourier spectrum, if any, and to discuss their origin in the context of binarity and fast rotation. In this paper, we study the properties of the stellar pulsations based on a careful analysis in the low-, intermediate- and high-frequency regions of the Fourier spectrum. This is done by performing repeated frequency-search analyses with successive prewhitenings of all the significant frequencies detected in the spectrum. Moreover, we searched for regular period spacings among the $g$ modes, as well as frequency splitting among the $g$ and $p$ modes. In the low-frequency regime, five regular period spacing patterns including one series of prograde $g$ modes and four series of retrograde $r$ modes were detected. The $r$ modes are well-distributed with respect to the harmonics of the rotational frequency of the fast-rotating star $f_{\rm rot}$ = 1.647 d$^{-1}$. The dominant $g$ mode is $f_{2}$ = 2.37 d$^{-1}$. The strongest p mode, at $f_{1}$ = 13.97 d$^{-1}$, forms a singlet. In the high-frequency region, we identified two multiplets of regularly split $p$ modes with mean frequency spacings of 0.42 d$^{-1}$ and 1.65 d$^{-1}$. We detected some series of retrograde $r$ and prograde $g$ modes as well as two multiplets of $p$ modes with frequency spacings related to the stellar rotation of both components of the twin system KIC~8975515. We identified the fast-rotating component as a hybrid pulsator with $r$ modes and the slowly-rotating component as a $δ$ Sct pulsator.
