论文标题
部分可观测时空混沌系统的无模型预测
LTD064402+245919, compact binary or subgiant with red star eclipsing binary?
论文作者
论文摘要
最近，Yang等人发现了单线光谱二进制LTD06402+245919。使用来自Lamost和ZTF的数据，估计看不见的伴侣的质量为1-3 $ m _ {\ odot} $，绕着轨道周期为14.50天的子巨人，使其成为无X射线排放的良好紧凑型二元候选者。然而，来自ZTF和ASAS-SN的新光曲线显示，一个倾角的深度向蓝色波长增加，表明LTD064402+245919更可能是红色星星的子巨头。使用Wilson-Devinney Code和Phoebe，次级的衍生$ T_ {EFF} $约为3400 K，对应于红色M2/3星。此外，盖亚（Gaia）的视差误差为20％。如果使用5.0kpc的精制距离，则子级的质量将为1.28 $ m _ {\ odot} $，而不是2.77 $ m _ {\ odot} $。然而，对于二进制特性的最终确认，保证了新的多色光度法。
Recently, a single-line spectroscopic binary, LTD064402+245919, has been discovered by Yang et al. Using data from LAMOST and ZTF, the unseen companion is estimated to have a mass of 1-3 $M_{\odot}$, orbiting a subgiant with orbital period of 14.50 days, making it a good compact binary candidate without X-ray emission. However, new light curves from ZTF and ASAS-SN, have shown the depth of one dip increases towards a bluer wavelength, indicating LTD064402+245919 is more likely to be a subgiant with a red star. Using both Wilson-Devinney code and Phoebe, the derived $T_{eff}$ of secondary is about 3400 K, corresponding to a red M2/3 star. Additionally, the 20% error of parallax from Gaia is large. The mass of subgiant will be 1.28 $M_{\odot}$ instead of 2.77 $M_{\odot}$, if the refined distance of 5.0kpc is used. Nevertheless, new multi-colour photometry are warranted for the final confirmation of binary properties.
