arXiv 1303.68712013-03-27astro-ph.SR

御夫座的长期光度行为分析

An Analysis of the Long-term Photometric Behavior of epsilon Aurigae

Brian Kloppenborg, Jeffery Hopkins, Robert Stencel

备注：: Published in JAAVSO v40n2 http://www.aavso.org/jaavso-v40n2 Also see http://adsabs.harvard.edu/abs/2012JAVSO..40..647K
发表信息：: 2012JAVSO..40..647K

摘要：

光减少50%的诱惑吸引了大量的观察者和研究人员每隔27年就来到阿穆尔，但很少有人注意到日食之外的系统。早在1800年代后期，人们就已经清楚地知道这个系统在全食之外会经历某种形式的准周期变化，但直到20世纪50年代中期，很少有人在他们的研究中考虑这种影响。在这项工作中，我们专注于在这个系统中看到的食外（OOE）变化。我们已经将来自81个不同观察者的27个历史测光来源数字化。其中两个来源提供了27年的日食间UBV测光，我们已经使用现代周期发现技术进行了分析。我们已经发现F星的变化是多周期的，至少有两个周期在时间上以大约-1.5天/年的delta（周期）演变。当这些周期以3,200天的间隔表现为近正弦变化时，就可以检测到这些周期。我们讨论我们的工作在进化的背景下，通过比较发现的行为在电子Aur与真正的超巨星和后AGB恒星相似的光谱类型。基于我们的定性比较，我们发现e-Aur系统中F星的光度行为更能指示超巨星行为。因此，这颗恒星更可能是一颗“传统的超巨星”，而不是一颗后AGB天体。我们鼓励继续对这个系统进行光度监测，以检验我们的预测。

英文摘要：

The lure of a 50 percent reduction in light has brought a multitude of observers and researchers to epsilon 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 multiperiodic with at least two periods that evolve in time at delta(Period) approximately -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 e 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 e 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.

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英文摘要：

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