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arXiv 2104.01059astro-ph.GAastro-ph.SR
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利用多色测光和GAIA EDR3天体测量对研究不足的北方疏散星团PDKEEPAAA1348进行详细分析

Detailed analysis of the poorly studied northern open cluster NGC 1348 using multi-color photometry and GAIA EDR3 astrometry

D. Bisht, Qingfeng Zhu, W. H. Elsanhoury, Devesh P. Sariya, Geeta Rangwal, R. K. S. Yadav, Alok Durgapal, Ing-Guey Jiang

备注：
14 Figures, 4 Tables, Accepted for publication by the Publication of the Astronomical Society of Japan (PASJ)
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摘要：

在银河系的噪声环境中，疏散星团的成员确定仍然是一个悬而未决的问题。本文的主要目的是利用盖亚EDR3天体测量中恒星的自行和视差值来提供恒星的成员概率。除了盖亚天体测量，我们还使用了其他光度数据集，如UKIDSS，WISE，APASS和Pan-STARRS 1，以了解从光学到中红外区域的星系团性质。我们选取了438个成员概率高于$50\%$和G $\le$ 20 mg的可能成员，得到自行平均值为$μ_{x}=1.27\pm0.001$和$μ_{y}=-0.73\pm0.002$ mas yr $^{-1}$。利用径向密度分布确定星团的半径为7.5弧分（5.67 pc）。我们的分析表明，NGC 1348位于$2.6\pm0.05$ kpc的距离。质量函数斜率为$1.30\pm0.18$，质量范围为1.0 $-$ 4.1 $M_\odot$，与Salpeter值在1 $σ$不确定度范围内相当一致。本研究证实NGC 1348是一个动态弛豫的星系团。我们计算出NGC1348的顶点坐标$(A, D)$为$(A_\circ, D_\circ)$ = $(-23^{\textrm{o}}.815\pm 0^{\textrm{o}}.135$，$-22^{\textrm{o}}.228\pm 0^{\textrm{o}}.105)$。此外，还计算了速度椭球参数（VEP）、矩阵元$μ_{ij}$、方向余弦（$l_j$、$m_j$、$n_j$）和顶点的银河经度。

英文摘要：

The membership determination for open clusters in noisy environments of the Milky Way is still an open problem. In this paper, our main aim is provide the membership probability of stars using proper motions and parallax values of stars using Gaia EDR3 astrometry. Apart from the Gaia astrometry, we have also used other photometric data sets like UKIDSS, WISE, APASS and Pan-STARRS1 in order to understand cluster properties from optical to mid-infrared regions. We selected 438 likely members with membership probability higher than $50\%$ and G$\le$20 mag. We obtained the mean value of proper motion as $μ_{x}=1.27\pm0.001$ and $μ_{y}=-0.73\pm0.002$ mas yr$^{-1}$. The cluster's radius is determined as 7.5 arcmin (5.67 pc) using radial density profile. Our analysis suggests that NGC 1348 is located at a distance of $2.6\pm0.05$ kpc. The mass function slope is found to be $1.30\pm0.18$ in the mass range 1.0$-$4.1 $M_\odot$, which is in fair agreement with Salpeter's value within the 1$σ$ uncertainty. The present study validates that NGC 1348 is a dynamically relaxed cluster. We computed the apex coordinates $(A, D)$ for NGC 1348 as $(A_\circ, D_\circ)$ = $(-23^{\textrm{o}}.815\pm 0^{\textrm{o}}.135$, $-22^{\textrm{o}}.228\pm 0^{\textrm{o}}.105)$. In addition, calculations of the velocity ellipsoid parameters (VEPs), matrix elements $μ_{ij}$, direction cosines ($l_j$, $m_j$, $n_j$) and the Galactic longitude of the vertex have been also conducted in this analysis.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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