御夫座$ε$极端双星的干涉测量研究：食前观测
Interferometric Studies of the extreme binary, $ε$ Aurigae: Pre-eclipse Observations
摘要：
我们报告新的和存档的K波段干涉均匀盘直径获得的帕洛玛试验台干涉仪的食双星$ε$御夫座，提前开始在2009年的日食。观测的目的是测试系统中的低振幅变化是否与F超巨星（主星）有关，或者与连接恒星和巨大暗盘（次级）的系统间物质有关，这些物质被推断为导致日食。造父变星一样的径向脉动的F星没有被检测到，也没有发现证据，建议每十年收缩6%的F星。测量到的2.27 +/- 0.11毫角秒K波段直径与依巴谷距离为625 pc的300倍太阳半径F超巨星一致。这些结果为2009-2011年日食期间的观测提供了更好的背景。
英文摘要：
We report new and archival K-band interferometric uniform disk diameters obtained with the Palomar Testbed Interferometer for the eclipsing binary star $ε$ Aurigae, in advance of the start of its eclipse in 2009. The observations were inteded to test whether low amplitude variations in the system are connected with the F supergiant star (primary), or with the intersystem material connecting the star with the enormous dark disk (secondary) inferred to cause the eclipses. Cepheid-like radial pulsations of the F star are not detected, nor do we find evidence for proposed 6% per decade shrinkage of the F star. The measured 2.27 +/- 0.11 milli-arcsecond K band diameter is consistent with a 300 times solar radius F supergiant star at the Hipparcos distance of 625 pc. These results provide an improved context for observations during the 2009-2011 eclipse.
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