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arXiv 2311.16248astro-ph.SR
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TIC 184743498:首个三轴恒星脉动体

TIC 184743498: The First Tri-Axial Stellar Pulsator

Valencia Zhang, Saul Rappaport, Rahul Jayaraman, Donald W. Kurtz, Gerald Handler, James Fuller, Tamas Borkovits

AI总结:

本文报道在紧密双星TIC 184743498中发现首个三轴δ Scuti脉动体,其九个脉动模式分别沿潮汐轴、垂直轴和轨道/自转轴三个方向,揭示了恒星脉动的新几何构型。

摘要:

我们在一个紧密双星系统(P = 1.053 d)中发现了一颗δ Scuti脉动星,其具有九个脉动模式,频率介于38至56 d$^{-1}$之间。每个模式在每个轨道周期内表现出两次振幅调制和π弧度的相位偏移。其中五个模式的振幅和相位偏移可以很容易地解释为沿着与双星潮汐轴对齐的轴线的偶极脉动。该系统的独特之处在于其余四个脉动模式,我们证明它们是沿着垂直于潮汐轴和双星轨道角动量轴的轴线的偶极脉动。此外,还有两个脉动模式的振幅和相位随轨道相位没有显著变化;它们被解释为沿着与轨道/自转轴对齐的轴线的偶极模式。因此,我们提出TIC 184743498是一个三轴脉动体,这是首次发现此类天体。

英文摘要:

We have discovered a $δ$ Scuti pulsator in a tight binary (P = 1.053 d) with nine pulsation modes whose frequencies are between 38 and 56 d$^{-1}$. Each of these modes exhibits amplitude modulations and $π$-rad phase shifts twice per orbital cycle. Five of these modes exhibit amplitude and phase shifts that are readily explained by dipole pulsations along an axis that is aligned with the binary's tidal axis. The novelty of the system lies in the remaining four pulsation modes, which we show are dipole pulsations along an axis that is perpendicular to both the tidal axis and the binary's orbital angular momentum axis. There are additionally two pulsation modes whose amplitudes and phases do not change significantly with orbital phase; they are explained as dipole modes along an axis aligned with the orbital/rotation axis. Hence, we propose that TIC 184743498 is a tri-axial pulsator, the first of its kind.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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