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arXiv 2401.02583astro-ph.SR
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活动双星系统原型RS CVn的日珥探测与色球特征

Prominence detection and chromosphere feature on the prototype RS CVn of active binary systems

Dongtao Cao, Shenghong Gu, U. Wolter, M. Mittag, J. H. M. M. Schmitt, Dongyang Gao, Shaoming Hu

AI总结:

本研究分析了活动双星原型RS CVn的高分辨率光谱,利用光谱减法探测到主星周围的类日珥物质及光学耀斑,并发现色球活动经度的演化特征。

摘要:

我们展示了对活动双星系统原型RS Canum Venaticorum (RS CVn)高分辨率光谱的研究。我们的数据是1998年至2017年间使用不同望远镜获得的。我们利用光谱减法技术分析了色球活动指标Ca II IRT、H$_α$、Na I D$_{1}$、D$_{2}$双线、He I D$_{3}$和H$_β$。色球发射主要来自K2 IV主星,而F5 V伴星仅在少数光谱中显示出微弱的发射特征。我们在主食附近拍摄的光谱中,发现减除后的H$_α$谱线和其他活动指标存在过量的吸收特征,我们将其归因于与主星相关的类日珥物质。我们基于双星系统的几何结构估算了这些暂定日珥的尺寸极限,并研究了最强日珥的物理性质。我们探测到一次光学耀斑,其特征为He I D$_{3}$谱线发射,并伴随其他活动谱线更强的发射。该耀斑能量与在其他RS CVn型恒星上观测到的强耀斑大致相当。RS CVn的色球活动经度最常出现在系统的两个方照附近,并在观测运行之间显示出变化,这表明其活动区域正在持续演化。

英文摘要:

We present a study of high-resolution spectra of RS Canum Venaticorum (RS CVn), a prototype of active binary systems. Our data were obtained from 1998 to 2017 using different telescopes. We analyze the chromospheric activity indicators Ca II IRT, H$_α$, Na I D$_{1}$, D$_{2}$ doublet, He I D$_{3}$, and H$_β$ using a spectral subtraction technique. The chromospheric emission stems mainly from the K2 IV primary star, while the F5 V secondary star only shows weak emission features in a few of our spectra. We find excess absorption features in the subtracted H$_α$ lines and other activity indicators from spectra taken near primary eclipse, which we ascribe to prominence-like material associated with the primary star. We estimate size limits of these tentative prominences based on the geometry of the binary system, and investigate the physical properties of the strongest prominence. An optical flare, characterized by He I D$_{3}$ line emission, together with stronger emission in other activity lines, was detected. The flare energy is roughly comparable to strong flares observed on other RS CVn-type stars. The chromospherically active longitudes of RS CVn most frequently appear near the two quadratures of the system and display changes between observing runs, which indicates an ongoing evolution of its active regions.

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