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arXiv 2301.04409astro-ph.SR
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脉动食双星AI Hya的综合光谱和光度研究

Comprehensive spectroscopic and photometric study of pulsating eclipsing binary star AI Hya

F. Kahraman Alicavus, T. Pawar, K. G. Hełminiak, G. Handler, A. Moharana, F. Alicavus, P. De Cat, F. Leone, G. Catanzaro, M. Giarrusso, N. Ukita, E. Kambe

摘要:

脉动食双星是一个引人注目的系统,它提供了一个探测恒星内部和精确确定恒星基本参数的机会。特别是具有脉动分量的分离食双星系统,由于双星效应可以忽略,因此对了解系统的振荡性质具有重要意义。最近基于空间数据的研究表明,一些振荡星的脉动机制尚未完全了解。因此,对一些分离食双星中的脉动星的全面研究是重要的。在这项研究中,我们提出了一个详细的分析脉动分离食双星系统AI Hya,这是由两个独立的小组用不同的方法进行了研究。我们进行了光谱调查,估计轨道参数,通过径向速度测量和大气参数的每个二元组件使用的复合和/或解开的光谱。我们发现,系统中更明亮的部分是一颗大质量、冷且化学性质正常的恒星,而较热的双星部分是一颗稍微富含金属的天体。AI Hya的基本参数是通过分析二元变化来确定的,随后用于进化建模。因此,我们得到的系统的年龄为850 $\pm$ 20百万年,并发现这两个二进制组件位于三角洲盾牌座不稳定带。频率分析揭示了5.5 - 13.0 d $^{-1}$之间的脉动频率,我们试图估计哪个二进制分量是脉动的。然而,事实证明,这些频率可能来自两个二进制分量。

英文摘要:

The pulsating eclipsing binaries are remarkable systems that provide an opportunity to probe the stellar interior and to determine the fundamental stellar parameters precisely. Especially the detached eclipsing binary systems with (a) pulsating component(s) are significant objects to understand the nature of the oscillations since the binary effects in these systems are negligible. Recent studies based on space data have shown that the pulsation mechanisms of some oscillating stars are not completely understood. Hence, comprehensive studies of a number of pulsating stars within detached eclipsing binaries are important. In this study, we present a detailed analysis of the pulsating detached eclipsing binary system AI Hya which was studied by two independent groups with different methods. We carried out a spectroscopic survey to estimate the orbital parameters via radial velocity measurements and the atmospheric parameters of each binary component using the composite and/or disentangled spectra. We found that the more luminous component of the system is a massive, cool and chemically normal star while the hotter binary component is a slightly metal-rich object. The fundamental parameters of AI Hya were determined by the analysis of binary variations and subsequently used in the evolutionary modelling. Consequently, we obtained the age of the system as 850 $\pm$ 20 Myr and found that both binary components are situated in the Delta Scuti instability strip. The frequency analysis revealed pulsation frequencies between the 5.5 - 13.0 d$^{-1}$ and we tried to estimate which binary component is the pulsating one. However, it turned out that those frequencies could originate from both binary components.

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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