色球活跃双星EI波江座II。长期多普勒成像
The chromospherically active binary star EI Eridani II. Long-term Doppler imaging
摘要：
对活跃的RS CVn型双星Ei Eridani进行了11年的连续光谱观测，这些观测数据是在NSO/McMath-Pierce、KPNO/Coude Feed和MUSICOS 98活动期间获得的，用于获得32个历元的三条光谱线的34幅多普勒图，其中28幅是相互独立的。从我们的多普勒地图中提取各种参数：平均温度，分数斑点，和纵向和横向斑点发生函数。我们发现，这些参数都没有显示出明显的变化，也没有与建议的活动周期从光度长期观测的相关性。这表明光度亮度周期可能不一定仅仅是由于冷点周期。在整个11年期间，斑点图案的一般形态仍然持续存在。从我们所有的图像中恢复了一个大的帽状极点。高度可变的活动被注意到附近的纬度约。60-70度，极斑的附属物出现并溶解。
英文摘要：
Data from 11 years of continuous spectroscopic observations of the active RS CVn-type binary star EI Eridani - gained at NSO/McMath-Pierce, KPNO/Coude Feed and during the MUSICOS 98 campaign - were used to obtain 34 Doppler maps in three spectroscopic lines for 32 epochs, 28 of which are independent of each other. Various parameters are extracted from our Doppler maps: average temperature, fractional spottedness, and longitudinal and latitudinal spot-occurrence functions. We find that none of these parameters show a distinct variation nor a correlation with the proposed activity cycle as seen from photometric long-term observations. This suggests that the photometric brightness cycle may not necessarily be due to just a cool spot cycle. The general morphology of the spot pattern remains persistent over the whole period of 11 years. A large cap-like polar spot was recovered from all our images. A high degree of variable activity was noticed near latitudes of approx. 60-70 degrees where the appendages of the polar spot emerged and dissolved.
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