AI 中文总结
本研究针对天龙座BV与BW星系统，利用新测光与光谱数据构建模型，确认该系统双星对的食时刻变异性，发现BW星表面存在星斑及行为可能与周期变化相关。
AI 中文摘要
天龙座BV与BW星系统是一个独特的共面系统，包含两颗相接食双星。本研究的主要目标是基于新观测数据构建该系统的模型，因为该系统唯一的模型是40年前获得的。研究人员收集了新的测光与光谱数据：亮度测量采用差分孔径测光法，视向速度测量采用互相关法；所得曲线使用Wilson-Devinney法进行分析。结果显示，新模型与旧模型相似，但四个子星的质量更高，且差异超出误差范围。对于BW星，测光数据表明其恒星表面存在一个星斑。基于光谱与测光数据，研究人员获得了最新的食时刻测量结果，结合其他新测量数据，证实了此前的发现：两个双星对均表现出食时刻变异性。对于BV星，其抛物线与正弦趋势得到确认并细化；而对于BW星的另一对，研究人员观察到其行为发生了可能与周期变化相关的改变。
英文摘要
The BV & BW Draconis system is a unique coplanar system of two eclipsing contact binaries. The main objective of this study is to develop a model based on new observations. The only model of the system was obtained 40 years ago. New photometric and spectroscopic data have been collected. Brightness measurements were performed using the differential aperture photometry method, while radial velocity measurements were performed using the cross-correlation method. The resulting curves were analyzed using the Wilson-Devinney method. The resulting model is similar to the one obtained previously; however, the masses of the four components are higher, and the differences are outside the margin of error. In the case of BW Dra, the photometric data indicate the presence of a spot on the star's surface. Based on our spectroscopic and photometric data, the latest measurements of eclipse times have been obtained. These results, together with other new measurements, confirm previous findings: both pairs exhibit eclipse time variability. In the case of BV Dra, the parabolic and sinusoidal trends were confirmed and refined. For the second pair, BW Dra, a change in behavior was observed that may be related to a change in period.
Comments11 pages, submitted to Acta Astronomica
