论文标题
矮nova kz宝石的后续地面观测
Followup ground-based observations of the dwarf nova KZ Gem
论文作者
论文摘要
我们介绍了矮人Nova（DN）Kz Gem附近恒星的光谱，以确认其鉴定，这在文献中一直模棱两可。分析从2014年到2019年的73个径向速度的分析提供了0.2224628（2）\，d（$ \ sim5.34 $ \，hr）的高精度轨道周期，并显示Kz \，gem，是双线dn的宝石。从2016年到2018年进行的时间序列光度法显示了可变的双驼峰调制，其全幅度为$ \ sim0.3 $ \，mag，以及五个持续$ \ sim30 $ \的高斯式瞬态事件，最小值或更多。使用光曲线代码Xrbinary和非线性拟合代码NMFIT，我们从时间序列光度法中获得了优化的矮nova（DN）KZ GEM的二进制二进制模型，由Roche-Lobe-filling K Type dwarf组成，其质量转移率为$ 2.7 \，7.9 \， - \， - \， - \， - \， - \， - \，\，\，\，\，\，\，\，\， - \， - \， - \， - \ \， - \， - \， - \， - \， - \， m} _ {\ odot} \，{\ rm yr}^{ - 1} $ to围绕白色矮人的大，凉爽且厚的磁盘，在轨道上，倾向于$ 51^{\ circ} .6（\ pm1^{\ pm1^{\ circ} .4）$。证明磁盘上的两个热点会导致次级恒星的椭圆形调制中观察到的变化。该物理模型与kz \ gem的Gaia距离兼容。
We present spectroscopy of stars in the immediate vicinity of the dwarf nova (DN) KZ Gem to confirm its identification, which had been ambiguous in the literature. Analysis of 73 radial velocities spanning from 2014 to 2019 provides a high-precision orbital period of 0.2224628(2)\,d ($\sim5.34$\,hr) and shows KZ\,Gem to be a double-lined DN. Time series photometry taken from 2016 to 2018 shows a variable double-hump modulation with a full amplitude of $\sim0.3$\,mag, along with five Gaussian-like transient events lasting $\sim30$\,min or more. Using the light curve code XRBinary and nonlinear fitting code NMfit, we obtain an optimized binary model of the dwarf nova (DN) KZ Gem, from time series photometry, consisting of a Roche-lobe-filling K type dwarf with a mass transfer rate of $2.7\,-\,7.9\times10^{-10}\,{\rm M}_{\odot}\,{\rm yr}^{-1}$ to a large, cool and thick disk surrounding a white dwarf, in an orbit with an inclination of $51^{\circ}.6(\pm1^{\circ}.4)$. Two hotspots on the disk are demonstrated to cause the observed variations in the ellipsoidal modulations from the secondary star. This physical model is compatible with the Gaia distance of KZ\,Gem.
