论文标题
两个新的双线光谱二进制白色矮人
Two new Double-lined Spectroscopic Binary White Dwarfs
论文作者
论文摘要
我们提出了四个二元白色矮人候选者的径向速度观察结果，这些候选者通过其过度亮度确定。我们确定两个新的双线光谱二进制系统，WD 0311-649和WD 1606+422，并约束其轨道参数。 WD 0311-649是一个17.7 h的周期系统，质量比为$ 1.44 \ pm 0.06 $，WD 1606+422是一个20.1 h时期系统，质量比为$ 1.33 \ pm 0.03 $。一个附加的对象WD 1447-190是43小时的单层白色矮人二进制二进制，而WD 1418-088没有显示从分钟为几分钟到几十年不等的时间标准的任何显着速度变化。我们介绍了Bedard等人鉴定的14个过度的白色矮人的概述，并发现双线和单层系统的比例均为31％。但是，这些过多的白色矮人中有31％没有显示出任何明显的径向速度变化。我们证明，这些必须是在盖亚天体可能解决的长周期二进制文件中。我们还讨论了间谍调查中确定的单个低质量白色矮人的过度，并建议其中一些系统也可能是更庞大的白色矮人的长期二元系统。
We present radial velocity observations of four binary white dwarf candidates identified through their over-luminosity. We identify two new double-lined spectroscopic binary systems, WD 0311-649 and WD 1606+422, and constrain their orbital parameters. WD 0311-649 is a 17.7 h period system with a mass ratio of $1.44 \pm 0.06$ and WD 1606+422 is a 20.1 h period system with a mass ratio of $1.33 \pm 0.03$. An additional object, WD 1447-190, is a 43 h period single-lined white dwarf binary, whereas WD 1418-088 does not show any significant velocity variations over timescales ranging from minutes to decades. We present an overview of the 14 over-luminous white dwarfs that were identified by Bedard et al., and find the fraction of double- and single-lined systems to be both 31%. However, an additional 31% of these over-luminous white dwarfs do not show any significant radial velocity variations. We demonstrate that these must be in long-period binaries that may be resolved by Gaia astrometry. We also discuss the over-abundance of single low-mass white dwarfs identified in the SPY survey, and suggest that some of those systems are also likely long period binary systems of more massive white dwarfs.
