KIC 2857323: A Double-mode High-amplitude δ Scuti Star with Amplitude Decline of the First Overtone Mode

KIC 2857323: A Double-mode High-amplitude δ Scuti Star with Amplitude Decline of the First Overtone Mode
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KIC 2857323:具有第一泛音模态振幅下降的双模高振幅δ盾牌星

DOI:
10.3847/1538-4357/ac86c9
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发表时间:
2022-08
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Ali Esamdin
Ali Esamdin
中科院分区:
其他
文献类型:
--
作者:
Taozhi Yang;Zhao-Yu Zuo;Xiao-Ya Sun;Rui-Xuan Tang;Ali Esamdin

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我们利用开普勒任务的高精度观测资料研究了KIC 2857323的脉动行为。对4年时间序列数据的傅立叶分析表明,光的变化有五个独立的频率。其中,周期比为0.774的两个强频率f1和f3确定该恒星为双模(即基模f0和第一泛音模f1)高振幅δScuti星(HADS)。利用两个径向模式F0和F1进行的地震模拟表明,KIc 2857323是一颗主序列星,质量M=1.78±0.02M⊙,金属丰度Z介于0.009~0.012之间。我们用相位调制方法分析了F0和F1的相位和幅度变化,发现第一泛音模式F1的幅度下降较慢。我们讨论了振幅变化的几种可能原因,并推测这颗恒星的振幅下降可能是由于脉动能量损失所致。我们注意到,KIC 2857323是第一个显示幅度下降的双模HAD,值得进一步研究以确定其性质。
We investigate the pulsating behavior of KIC 2857323 using high-precision observations from the Kepler mission. Fourier analysis of 4 yr time-series data reveals five independent frequencies for the light variation. Among them, two strong frequencies f 1 and f 3 with a period ratio of 0.774 identify this star as a double-mode (i.e., the fundamental mode F0 and first overtone mode F1) high-amplitude δ Scuti star (HADS). Seismic modeling using the two radial modes F0 and F1 indicates that KIC 2857323 is a main-sequence star with mass M = 1.78 ± 0.02 M ⊙ and metallicity Z from 0.009 to 0.012. We analyze the phase and amplitude variations of F0 and F1 using the phase modulation method and find that the first overtone mode F1 shows a slow decline in amplitude. We discuss several possible causes for the amplitude variation and speculate that the amplitude decline in this star may be due to pulsation energy loss. We note that KIC 2857323 is the first double-mode HADS to show amplitude decline and warrants further study to ascertain its nature.
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