论文标题
部分可观测时空混沌系统的无模型预测
Searching for Variable Stars in the Open Cluster NGC 2355 and Its Surrounding Region
论文作者
论文摘要
我们已经根据时间序列光度观察数据研究了NGC 2355周围田间的可变恒星。 Nanshan一米宽场望远镜在13晚的V频段中获得了3000多个CCD帧。我们已经检测到88个变量恒星，其中包含72个新的可变星和16个已知变量。通过分析这些光曲线，我们将可变恒星分类如下：26个黯然失色的二进制方法，52个脉动恒星，4个旋转变量和6个不清楚的变量恒星，其周期比选择时间基线的时间长得多。 NGC 2355使用GAIA DR2视差，运动学和光度法，还分析了这些变量恒星的群集成员身份。除了Cantat-Gaudin等人报告的11个变量成员外。 （2018年），我们确定了位于NGC 2355外部区域的4个可变成员候选物，并在空间位置和群集成员的运动特性中显示同质性。 NGC 2355的主要物理参数从两色和颜色标记图估算为log（年龄/yr）= 8.9，e（b -v）= 0.24 mag和[fe/h] = -0.07 dex。
We have investigated the variable stars in the field surrounding NGC 2355 based on the time-series photometric observation data. More than 3000 CCD frames were obtained in the V band spread over 13 nights with the Nanshan One-meter Wide-field Telescope. We have detected 88 variable stars, containing 72 new variable stars and 16 known variable stars. By analyzing these light curves, we classified the variable stars as follows: 26 eclipsing binaries, 52 pulsating stars, 4 rotating variables, and 6 unclear type variable stars for which their periods are much longer than the time baseline chosen. Employing Gaia DR2 parallax, kinematics, and photometry, the cluster membership of these variable stars were also analyzed for NGC 2355. In addition to the 11 variable members reported by Cantat-Gaudin et al. (2018), we identify 4 more variable member candidates located at the outer region of NGC 2355 and showed homogeneity in space positions and kinematic properties with the cluster members. The main physical parameters of NGC 2355 estimated from the two-color and color-magnitude diagrams are log(age/yr) = 8.9, E(B - V) = 0.24 mag, and [Fe/H] = - 0.07 dex.
