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首页> 外文期刊>The Journal of the American Association of Variable Star Observers >An Analysis of the Long-term Photometric Behavior of ε Aurigae
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An Analysis of the Long-term Photometric Behavior of ε Aurigae

机译：εAurigae的长期光度行为分析

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摘要

The lure of a 50% reduction in light has brought a multitude of observers and researchers to ε Aur every twenty-seven years, but few have paid attention to the system outside of eclipse. As early as the late 1800s, it was clear that the system undergoes some form of quasi-periodic variation outside of totality, but few considered this effect in their research until the mid-1950s. In this work we focus exclusively on the out-of-eclipse (OOE) variations seen in this system. We have digitized twenty-seven sources of historic photometry from eighty-one different observers. Two of these sources provide twenty-seven years of inter-eclipse UBV photometry which we have analyzed using modern period finding techniques. We have discovered the F-star variations are multi-periodic with at least two periods that evolve in time at ?P = -1.5 day/year. These periods are detected when they manifest as near-sinusoidal variations at 3,200-day intervals. We discuss our work in an evolutionary context by comparing the behavior found in ε Aur with bona-fide supergiant and post-AGB stars of similar spectral type. Based upon our qualitative comparison, we find the photometric behavior of the F-star in the 6 Aur system is more indicative of supergiant behavior. Therefore the star is more likely to be a "traditional supergiant" than a post-AGB object. We encourage continued photometric monitoring of this system to test our predictions.
机译：光线减少50％的诱惑每隔二十七年就使众多的观察者和研究人员来到εAur，但很少有人关注日食以外的系统。早在1800年代末期，很明显该系统就经历了某种形式的准周期变化，而不是全部变化，但是直到1950年代中期，很少有人在研究中考虑到这种影响。在这项工作中，我们仅关注该系统中出现的偏食（OOE）变化。我们已经数字化了来自81位不同观察者的27个历史测光源。这些来源中有两个提供了27年的日间UBV光度法，我们已经使用现代的寻时技术对其进行了分析。我们发现F星的变化是多周期的，至少有两个周期随时间变化，ΔP= -1.5天/年。当这些周期以3200天为间隔出现近正弦变化时，就可以检测到这些周期。通过比较在εAur中发现的善意超巨星和类似光谱类型的AGB后恒星的行为，我们在进化背景下讨论了我们的工作。根据我们的定性比较，我们发现F-star在6 Aur系统中的光度行为更能指示超巨星行为。因此，与AGB后的天体相比，恒星更有可能是“传统的超巨星”。我们鼓励对该系统进行持续的光度监测以检验我们的预测。

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