Velocities of WOCS 24009 and WOCS 40007 in NGC 6819
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As part of our study of the old (~2.5Gyr) open cluster NGC 6819 in the Kepler field, we present photometric (Kepler and ground-based BVR_C_I_C_) and spectroscopic observations...
作为针对开普勒天区中年龄约25亿年的疏散星团NGC 6819的研究的一部分,我们展示了开普勒卫星及地面BVR_C_I_C_波段测光与光谱观测……



