论文标题
$ \ textIt {gaia} $ Ultra-Cool矮人样本$ - $ iii：七个新的多个系统，包含至少一个$ \ textit {gaia} $ dr2 Ultra ultra-cool dwarf
The $\textit{Gaia}$ Ultra-Cool Dwarf Sample $-$ III: Seven new multiple systems containing at least one $\textit{Gaia}$ DR2 ultra-cool dwarf
论文作者
论文摘要
我们在使用$ \ textit {gaia} $ dr2数据发现的七个宽二进制系统中介绍了十个新的超级矮小矮人，该系统被标识为我们的$ \ textit {gaia} $ textit {gaia} $ ulta-cool矮人示例项目。这里介绍的七个系统包括G5 IV Star HD 164507的L1同伴，L1：V478 Lyr AB系统的同伴，是金属罚款K5 V Star CD-28 8692的L2伴侣，M9 V的同伴，M9 V的同伴，是年轻可变的K0 K0 K0 v Star Lt uma，以及三个低水平的Binaries and Shir-Mass Binaries and Sest and ls and ls and ls。 HD 164507，CD-28 8692，V478 LYL和LT UMA系统是特别重要的基准，因为原始人的特征很好，并且对同伴的大气参数和年龄提供了极好的约束。我们发现，与类似频谱类型的M矮人相比，M8 V Star 2Mass J23253550+4608163是$ \ sim $ 2.5 mag的过多，但与此同时，它在其近乎交易频谱中并没有表现出明显的特殊性。仅通过未解决的二进制性来解释其过度浮力。最后，我们提出了一个L1+L2系统，其物理分离为959 au，这使其成为当前已知的最广泛的L+L二进制。
We present ten new ultra-cool dwarfs in seven wide binary systems discovered using $\textit{Gaia}$ DR2 data, identified as part of our $\textit{Gaia}$ Ultra-Cool Dwarf Sample project. The seven systems presented here include an L1 companion to the G5 IV star HD 164507, an L1: companion to the V478 Lyr AB system, an L2 companion to the metal-poor K5 V star CD-28 8692, an M9 V companion to the young variable K0 V star LT UMa, and three low-mass binaries consisting of late Ms and early Ls. The HD 164507, CD-28 8692, V478 Lyr, and LT UMa systems are particularly important benchmarks, because the primaries are well characterised and offer excellent constraints on the atmospheric parameters and ages of the companions. We find that the M8 V star 2MASS J23253550+4608163 is $\sim$2.5 mag overluminous compared to M dwarfs of similar spectral type, but at the same time it does not exhibit obvious peculiarities in its near-infrared spectrum. Its overluminosity cannot be explained by unresolved binarity alone. Finally, we present an L1+L2 system with a projected physical separation of 959 au, making this the widest L+L binary currently known.
