从斯隆数字巡天中选出的共同自行宽白矮星双星
Common Proper Motion Wide White Dwarf Binaries Selected From The Sloan Digital Sky Survey
摘要：
由两颗白矮星（WD）组成的宽双星受到的关注远不如它们的紧双星。然而，我们使用二进制人口合成代码{ \tt StarTrack}的测试表明，对于任何一组合理的初始条件，存在着一个显着的可观测人口的双白矮星（WDWDs）的轨道间隔为10 $^2$至10 $^5$ AU。我们采用Dhital等人的技术。在斯隆数字巡天最近确定的$>$ 12，000个光谱证实的氢-大气WD周围，寻找由$<10\amin$分隔的候选共同自行WD伴星。使用两种技术来分离随机比对的高置信度对，我们发现九个新的高概率宽WDWDs，并确认三个先前确定的候选宽WDWDs。这使得已知的宽WDWD的数量达到45个;我们的新对是样本的重要补充，特别是在小自行（$<$ 200 mas/yr）和大角距（$>$ 10 \asec）时。光谱的后续行动和这种方法的扩展到一个更大的，光度选择的SDSS WDs的集合可能最终产生一个足够大的数据集WDWDs实现其全部潜力作为恒星演化理论的试验台。
英文摘要：
Wide binaries made up of two white dwarfs (WDs) receive far less attention than their tight counterparts. However, our tests using the binary population synthesis code {\tt StarTrack} indicate that, for any set of reasonable initial conditions, there exists a significant observable population of double white dwarfs (WDWDs) with orbital separations of 10$^2$ to 10$^5$ AU. We adapt the technique of Dhital et al.\ to search for candidate common proper motion WD companions separated by $<10\amin$ around the $>$12,000 spectroscopically confirmed hydrogen-atmosphere WDs recently identified in the Sloan Digital Sky Survey. Using two techniques to separate random alignments from high-confidence pairs, we find nine new high-probability wide WDWDs and confirm three previously identified candidate wide WDWDs. This brings the number of known wide WDWDs to 45; our new pairs are a significant addition to the sample, especially at small proper motions ($<$200 mas/yr) and large angular separations ($>$10\asec). Spectroscopic follow-up and an extension of this method to a larger, photometrically selected set of SDSS WDs may eventually produce a large enough dataset for WDWDs to realize their full potential as testbeds for theories of stellar evolution.
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