RS后发座型星V711金牛座的色球活动模式进一步研究
Further Investigation on Chromospheric Activity Patterns of the RS Canum Venaticorum Star V711 Tauri
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中文总结 AI 辅助
通过对V711 Taurus的长期光谱观测，利用光谱减除法分析其色球活动指标，发现其存在两个活跃经度、可能的色球活动周期，且光球黑子与色球活跃区有紧密空间联系。
中文摘要 AI 辅助
我们呈现了对非常活跃的RS后发座（RS CVn）型星V711金牛座（V711 Tau）的新的长期光谱观测结果，这些观测是在2005年至2021年的多个观测期内获得的。通过光谱减除法，我们分析了多个光学色球活动指标，包括Ca II红外三重线、Hα、Na I D1和D2双线、He I D3以及Hβ线。V711 Tau在色球活动线中显示出强烈的过量发射，该发射主要与K1 IV主星成分相关；G5 V伴星成分也显示出微弱的发射特征。在我们的观测期间，共出现4次光学耀斑事件，其特征为He I D3线发射特征以及其他活动线中更强的发射，这些耀斑的量级与其他活跃RS CVn型星的强耀斑相似。我们将长期观测划分为12个观测组，发现V711 Tau在相位0.25和0.75附近有两个活跃经度，在大部分时间主导活动；其色球活动水平呈现长期变化，表明可能存在色球活动周期。此外，我们还发现V711 Tau在短时间和长时间尺度上，光球黑子与色球活跃区之间存在紧密的空间联系。
英文摘要
We present new long-term spectroscopic observations of the very active RS Canum Venaticorum (RS CVn) star V711 Tauri (V711 Tau), obtained during several observing runs from 2005 to 2021. By means of spectral subtraction technique, several optical chromospheric activity indicators $\mbox{Ca {\sc ii}}$ infrared triplet, H$_α$, $\mbox{Na {\sc i}}$ D$_{1}$, D$_{2}$ doublet, $\mbox{He {\sc i}}$ D$_{3}$, and H$_β$ lines, are analyzed. V711 Tau shows strong excess emission in the chromospheric activity lines, and the emission is mainly associated with the K1 IV primary component. The G5 V secondary component also shows weak emission features. There are four optical flare events during our observations, characterized by the $\mbox{He {\sc i}}$ D$_{3}$ line emission features and stronger emission in other activity lines, which have similar order of magnitude as the strong flares of other active RS CVn-type stars. We separate our long-term observations to twelve observing groups, and find that V711 Tau has two active longitudes around phases 0.25 and 0.75 to dominate the activity in most of time. The chromospheric activity level shows a long-term variation, indicating possible chromospheric activity cycle. Moreover, a close spatial connection between photospheric spots and chromospheric active regions in short and long timescale is found for V711 Tau.
