论文标题
潮汐对近核旋转的影响：在远程和光谱二进制中对35个开普勒$γ$ doradus星星的分析
The effect of tides on near-core rotation: analysis of 35 Kepler $γ$ Doradus stars in eclipsing and spectroscopic binaries
论文作者
论文摘要
我们系统地搜索了用$γ$ doradus脉动器将二进制文件剥落的重力和rossby-mode周期间距模式。这些恒星提供了一个绝佳的机会，可以测试F-和A型恒星中潮汐同步和角动量转运的理论。我们发现了35个系统，这些系统显示出清晰的模式，包括光谱二进制KIC 10080943。与45个非剥落的二进制文件结合使用了$γ$ dOR组件，这些二进制组件已使用脉动时机发现，我们测量了他们的近乎核心旋转速率和渐近周期的间隔。我们发现，如果轨道周期短于10天，那么许多恒星被潮汐锁定，其中传统旋转近似（tar）给出的近核旋转周期与轨道时期一致。与单颗星相比，二进制中的$γ$ dor恒星往往近核旋转速率较慢，这可能是潮汐旋转的结果。我们还发现三颗恒星的近核旋转速率极慢。为了解释这些，我们假设不稳定的潮汐振荡可以将角动量从恒星转移到轨道，并减慢同步下方的恒星，这是我们称为“反向潮汐”的过程。
We systematically searched for gravity- and Rossby-mode period spacing patterns in Kepler eclipsing binaries with $γ$ Doradus pulsators. These stars provide an excellent opportunity to test the theory of tidal synchronisation and angular momentum transport in F- and A-type stars. We discovered 35 systems that show clear patterns, including the spectroscopic binary KIC 10080943. Combined with 45 non-eclipsing binaries with $γ$ Dor components that have been found using pulsation timing, we measured their near-core rotation rates and asymptotic period spacings. We find that many stars are tidally locked if the orbital periods are shorter than 10 days, in which the near-core rotation periods given by the traditional approximation of rotation (TAR) are consistent with the orbital period. Compared to the single stars, $γ$ Dor stars in binaries tend to have slower near-core rotation rates, likely a consequence of tidal spin-down. We also find three stars that have extremely slow near-core rotation rates. To explain these, we hypothesise that unstable tidally excited oscillations can transfer angular momentum from the star to the orbit, and slow the star below synchronism, a process we refer to as `inverse tides'.
