V471 Tauri系统：一个多数据类型探测器
The V471 Tauri System: A Multi-datatype Probe
摘要：
金牛座V471是毕宿星团中的一颗白矮星-红矮星食双星，它以促进共同包络理论的发展而闻名，根据该理论，新星和其他灾难性的变星是由更宽的双星通过灾难性的轨道收缩形成的。我们对最近一次成像搜索的评估表明，该物体可能已经逃脱了检测，或者实际上已经被看到。证据的平衡继续有利于一个棕矮星伴星，距离食双星约12 AU。最近开发的算法发现统一的解决方案，从三个datestries。新的径向速度（RV）的红矮星和BV RCIC光变曲线同时解决了白矮星和红矮星RV的文献，uvby数据，MOST任务光变曲线，和40年的日食计时。基于精度的加权是各种数据集之间适当信息平衡的关键。模型星点的时间变化允许多个数据时代的统一解决方案。光变曲线的振幅强烈地表明，从1976年到1980年，光斑度逐渐减小，从1981年到2005年，光斑覆盖率大致保持不变。提出了一个解释缺乏显着的变化，在1981年的光变曲线，在现场和潮汐变化之间的竞争。估算了光度光谱距离。红矮星的质量比正常的K2 V恒星要大，甚至比几篇结构和演化论文中采用的还要大。这一结果的一个确定的原因是，大大改善了红矮星RV曲线现在存在。
英文摘要：
V471 Tauri, a white dwarf--red dwarf eclipsing binary in the Hyades, is well known for stimulating development of common envelope theory, whereby novae and other cataclysmic variables form from much wider binaries by catastrophic orbit shrinkage. Our evaluation of a recent imaging search that reported negative results for a much postulated third body shows that the object could have escaped detection or may have actually been seen. The balance of evidence continues to favor a brown dwarf companion about 12 AU from the eclipsing binary. A recently developed algorithm finds unified solutions from three datatypes. New radial velocities (RVs) of the red dwarf and BV RCIC light curves are solved simultaneously along with white dwarf and red dwarf RVs from the literature, uvby data, the MOST mission light curve, and 40 years of eclipse timings. Precision-based weighting is the key to proper information balance among the various datasets. Timewise variation of modeled starspots allows unified solution of multiple data eras. Light curve amplitudes strongly suggest decreasing spottedness from 1976 to about 1980, followed by approximately constant spot coverage from 1981 to 2005. An explanation is proposed for lack of noticeable variation in 1981 light curves, in terms of competition between spot and tidal variations. Photometric spectroscopic distance is estimated. The red dwarf mass comes out larger than normal for a K2V star, and even larger than adopted in several structure and evolution papers. An identified cause for this result is that much improved red dwarf RVs curves now exist.
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