2009-2011年御夫座日食期间中性钠和钾吸收的高节奏测量
High cadence measurement of neutral sodium and potassium absorption during the 2009-2011 eclipse of epsilon Aurigae
摘要：
本文介绍了利用小型望远镜网在日食期间对御夫座进行分光观测的结果。光谱的分辨率为0.35至0.65厘米，涵盖了2008年至2012年，日食期间的典型间隔为4天。本文特别介绍了K I 7699、Na D和Mg II 4481等谱线的变异。KI 7699的吸收在日食开始前3个月开始增加，到2012年3月调查结束时，亮度已经恢复到正常的日食外水平7个月后，还没有恢复到日食前的水平。食星对KI 7699谱线的贡献被分离出来，数据显示在进入和离开期间，过量吸收以一系列的步骤增加和减少。这被解释为日食天体内部结构的指示。在食时，F星被Na D波长的食星完全遮蔽。F星的径向速度和在任何给定时间F星前面的食物质的平均和最大径向速度已经被分离出来，并在整个日食过程中被跟踪。在日食外的F星RV中看到的准周期变化在日食期间继续存在。希望这些结果可以用于约束系统及其组件的拟议模型。
英文摘要：
The results of a spectroscopic survey of epsilon Aurigae during eclipse using a network of small telescopes are presented. The spectra have a resolution of 0.35 to 0.65Å and cover the period 2008 to 2012 with a typical interval of 4 days during eclipse. This paper specifically covers variations in the K I 7699Å, Na D and Mg II 4481Å lines. Absorption started increasing in the KI 7699Å line 3 months before the eclipse began photometrically and had not returned to pre eclipse levels by the end of the survey March 2012, 7 months after the brightness had returned to normal outside eclipse levels. The contribution of the eclipsing object to the KI 7699Å line has been isolated and the data show the excess absorption increasing and decreasing in a series of steps during ingress and egress. This is interpreted as an indication of structure within the eclipsing object. The F star is totally obscured by the eclipsing object at the Na D wavelength during eclipse. The radial velocity of the F star and the mean and maximum radial velocity of the eclipsing material in front of the F star at any given time have been isolated and tracked throughout the eclipse. The quasi-periodic variations seen in the F star RV outside eclipse continued during the eclipse. It is hoped that these results can be used to constrain proposed models of the system and its components.
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