Boyajian星的双通带Sonneberg板测光
Sonneberg plate photometry for Boyajian's Star in two passbands
摘要：
F3主序星KIC 8462852（博雅坚星）在开普勒任务的4年中，表现出深度（高达20%）的全天亮度下降，原因不明。根据哈佛天文台的底片分析，在1890年至1990年期间有0.164等（16%）的变暗。我们从德国Sonneberg天文台收集了一套独立的历史板块，涵盖了1934-1995年。B星有861等，V星有397等，我们发现这颗恒星的亮度恒定在每世纪0.03等（3%）。一致的结果被发现使用最好的119板的眼睛估计。结果得到了莫斯科斯滕伯格天文台的数据支持，该数据显示该恒星在1895年至1995年之间是恒定的。先前声称的长达一个世纪的变暗与我们在5 σ水平上的结果不一致，但是最近报道的开普勒数据中3%的适度变暗与我们的数据并不矛盾。我们发现没有周期性或更短的趋势在我们的限制5%每5年箱，但注意到一个可能的调光事件1978年10月24日。
英文摘要：
The F3 main sequence star KIC 8462852 (Boyajian's Star) showed deep (up to 20%) day-long brightness dips of unknown cause during the 4 years of the Kepler mission. A 0.164 mag (16%) dimming between 1890 and 1990 was claimed, based on the analysis of photographic plates from the Harvard Observatory. We have gathered an independent set of historic plates from Sonneberg Observatory, Germany, covering the years 1934-1995. With 861 magnitudes in B, and 397 magnitudes in V, we find the star to be of constant brightness within 0.03 mag per century (3%). Consistent outcomes are found using by-eye estimates of the best 119 plates. Results are supported by data from Sternberg Observatory, Moscow, which show the star as constant between 1895 and 1995. The previously claimed century-long dimming is inconsistent with our results at the 5-sigma level, however the recently reported modest dimming of 3% in the Kepler data is not inconsistent with our data. We find no periodicities or shorter trends within our limits of 5% per 5-year bin, but note a possible dimming event on 24 Oct 1978.
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