论文标题
使用多色光度法和GAIA DR2 ASTRETROTRID数据对研究不足的开放群集NGC 4337的研究调查
An investigation of poorly studied open cluster NGC 4337 using multi-color photometric and Gaia DR2 astrometric data
论文作者
论文摘要
我们使用2Mass，Wise，Apass和Gaia〜DR2数据库提供了研究不足的开放群集NGC 4337的综合分析（光度和运动学）。通过确定恒星的成员资格概率，我们通过使用适当的运动和从GAIA〜DR2获取的可行数据确定了624个最可能的成员，其成员概率高于$ 50 \％$。群集的平均正确运动以$μ__{x} = -8.83 \ pm0.01 $和$μ__{y} = 1.49 \ pm0.006 $ mas yr $^{ - 1} $。我们发现正常的星际灭绝向聚类区域。成员的径向分布提供了7.75 Arcmin（5.63 PC）的簇半径。估计年龄为$ 1600 \ pm180 $ MYR的年龄表明NGC 4337是一个旧的开放式群集，带有一堆红色的巨星。在质量范围0.75 $ -2.0 $ m_ \ odot $中，MAINSESERESES星的总体质量斜率被发现为$ 1.46 \ PM0.18 $，这与Salpeter的价值（x = 1.35）公平地一致。本研究表明，NGC 4337是动态放松的开放群集。使用银河电位模型，获得了NGC 4337的银河轨道。我们发现该对象沿着银河中心周围的圆形路径遵循。在运动学分析下，我们通过使用两种方法来计算Apex坐标$（a，d）$：（i）经典收敛点方法和（ii）AD-DIAGRAGR方法。获得的坐标为：$（a_ {cons}，d_ {cons}）$ =（96 $^{\ textrm {o}} $。27$ \ pm $ \ pm $ 0 $^{\ textrm {o}} $ 。10，13 $^{\ textrm {\ textrm {otextrm {o} $ pm pm pm pm pm。 0 $^{\ textrm {o}} $。27）$ \＆$ $（a_ \ circ，d_ \ circ）$ =（100 $^{\ textrm {o}} $。282$ \ pm $ \ pm $ 0 $^{\ textrm {o} $。分别为0 $^{\ textrm {o}} $。323）。我们还计算了速度椭圆形参数（VEP），矩阵元素（$μ__{ij} $），方向余弦（$ l_j $，$ m_j $，$ m_j $，$ n_j $）和顶点的银河经度（$ l_2 $）。
We present a comprehensive analysis (photometric and kinematical) of poorly studied open cluster NGC 4337 using 2MASS, WISE, APASS, and Gaia~DR2 database. By determining the membership probabilities of stars, we identified 624 most probable members with membership probability higher than $50\%$ by using proper motion and parallax data taken from Gaia~DR2. The mean proper motion of the cluster is obtained as $μ_{x}=-8.83\pm0.01$ and $μ_{y}=1.49\pm0.006$ mas yr$^{-1}$. We find the normal interstellar extinction towards the cluster region. The radial distribution of members provides a cluster radius of 7.75 arcmin (5.63 pc). The estimated age of $1600\pm180$ Myr indicates that NGC 4337 is an old open cluster with a bunch of red giant stars. The overall mass function slope for main-sequence stars is found as $1.46\pm0.18$ within the mass range 0.75$-$2.0 $M_\odot$, which is in fair agreement with Salpeter's value (x=1.35) within uncertainty. The present study demonstrates that NGC 4337 is a dynamically relaxed open cluster. Using the Galactic potential model, Galactic orbits are obtained for NGC 4337. We found that this object follows a circular path around the Galactic center. Under the kinematical analysis, we compute the apex coordinates $(A, D)$ by using two methods: (i) the classical convergent point method and (ii) the AD-diagram method. The obtained coordinates are: $(A_{conv}, D_{conv})$ = (96$^{\textrm{o}}$.27 $\pm$ 0$^{\textrm{o}}$.10, 13$^{\textrm{o}}$.14 $\pm$ 0$^{\textrm{o}}$.27) $\&$ $(A_\circ, D_\circ)$ = (100$^{\textrm{o}}$.282 $\pm$ 0$^{\textrm{o}}$.10, 9$^{\textrm{o}}$.577 $\pm$ 0$^{\textrm{o}}$.323) respectively. We also computed the Velocity Ellipsoid Parameters (VEPs), matrix elements ($μ_{ij}$), direction cosines ($l_j$, $m_j$, $n_j$) and the Galactic longitude of the vertex ($l_2$).
