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arXiv 2102.08391astro-ph.SR
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O+B食双星HD 165246的光变特征

Characterization of the variability in the O+B eclipsing binary HD 165246

Cole Johnston, Nicolas Aimar, Michael Abdul-Masih, Dominic. M. Bowman, Tim R. White, Calum Hawcroft, Hugues Sana, Sanjay Sekaran, Karan Dsilva, Andrew Tkachenko, Conny Aerts

摘要:

已知O型星经历了广泛的变化机制,起源于它们的表面和近核心区域。这种变异性及其潜在原因的表征和理解是进化计算不可或缺的。我们使用一个新的广泛的高分辨率光谱数据集,以表征在光谱和天基光度观测的O+B食双星HD~165246的变化。我们提出了一个更新的大气和二元解决方案的主要组成部分,涉及高水平的微湍流($13_{-1.3}^{+1.0}\,$ km\,s $^{-1}$)和质量的$M_1=23.7_{-1.4}^{+1.1}$ ~M $_{\odot}$,把它放在一个稀疏的探索区域的赫兹-罗素图。此外,我们推导出旋转频率的$0.690\pm 0.003\,$ d $^{-1}$从组合的光度和线轮廓的变化,这意味着主要的旋转在其临界开普勒旋转速率的40%。我们讨论了在这个大规模的二进制观察到的整体变化的潜在解释,并讨论其进化背景。

英文摘要:

O-stars are known to experience a wide range of variability mechanisms originating at both their surface and their near-core regions. Characterization and understanding of this variability and its potential causes are integral for evolutionary calculations. We use a new extensive high-resolution spectroscopic data set to characterize the variability observed in both the spectroscopic and space-based photometric observations of the O+B eclipsing binary HD~165246. We present an updated atmospheric and binary solution for the primary component, involving a high level of microturbulence ($13_{-1.3}^{+1.0}\,$km\,s$^{-1}$) and a mass of $M_1=23.7_{-1.4}^{+1.1}$~M$_{\odot}$, placing it in a sparsely explored region of the Hertzsprung-Russell diagram. Furthermore, we deduce a rotational frequency of $0.690\pm 0.003\,$d$^{-1}$ from the combined photometric and line-profile variability, implying that the primary rotates at 40\% of its critical Keplerian rotation rate. We discuss the potential explanations for the overall variability observed in this massive binary, and discuss its evolutionary context.

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