A comprehensive study of the open cluster NGC 6866
A comprehensive study of the open cluster NGC 6866
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DOI：
10.1093/mnras/stv1665
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发表时间：
2015-07
影响因子：
4.8
通讯作者：
Z. F. Bostancı;T. Ak;T. Yontan;S. Bilir;T. Guver;S. Ak;O. Cakirli;O. Ozdarcan;E. Paunzen
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文献类型：
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作者：
Z. F. Bostancı;T. Ak;T. Yontan;S. Bilir;T. Guver;S. Ak;O. Cakirli;O. Ozdarcan;E. Paunzen
我们给出了疏散星团NGC 6866天区的CCD $UBVRI$测光数据。利用该天区恒星的恒星密度分布确定了星团的结构参数。我们利用恒星的天体测量数据计算了恒星是星团物理成员的概率，并仅使用最有可能的成员进行进一步分析。通过独立的方法确定了星团的消光和金属丰度。星团中F和G型主序星的LAMOST光谱以及紫外超表明该星团的金属丰度约为太阳值。我们利用$U - B$与$B - V$双色图估计消光$E(B - V)=0.074 \pm 0.050$星等。通过将星团的颜色 - 星等图与PARSEC等时线进行拟合，分别得出NGC 6866的距离模数$\mu = 10.60 \pm 0.10$星等、距离$d = 1189 \pm 75$秒差距以及年龄$t = 813 \pm 50$百万年。NGC 6866的银河系轨道表明该星团在一个偏心率$e = 0.12$的略偏心轨道上运行。通过使用星团中最有可能的成员，得出质量函数斜率$x = 1.35 \pm 0.08$。
We present CCD $UBVRI$ photometry of the field of the open cluster NGC 6866. Structural parameters of the cluster are determined utilizing the stellar density profile of the stars in the field. We calculate the probabilities of the stars being a physical member of the cluster using their astrometric data and perform further analyses using only the most probable members. The reddening and metallicity of the cluster were determined by independent methods. The LAMOST spectra and the ultraviolet excess of the F and G type main-sequence stars in the cluster indicate that the metallicity of the cluster is about the solar value. We estimated the reddening $E(B-V)=0.074 \pm 0.050$ mag using the $U-B$ vs $B-V$ two-colour diagram. The distance modula, the distance and the age of NGC 6866 were derived as $\mu = 10.60 \pm 0.10$ mag, $d=1189 \pm 75$ pc and $t = 813 \pm 50$ Myr, respectively, by fitting colour-magnitude diagrams of the cluster with the PARSEC isochrones. The Galactic orbit of NGC 6866 indicates that the cluster is orbiting in a slightly eccentric orbit with $e=0.12$. The mass function slope $x=1.35 \pm 0.08$ was derived by using the most probable members of the cluster.