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The orbits of open clusters in the Galaxy
Zhen-Yu Wu, Xu Zhou, Jun Ma +1
We present and analyze kinematics and orbits for a sample of 488 open clusters in the Galaxy. The velocity ellipsoid for our present sample is derived as (, , $σ_{W})…
Variable Stars in the Field of the Open Cluster NGC 2126
Shun-Fang Liu, Zhen-Yu Wu, Xiao-Bin Zhang +5
We report the results of a time-series CCD photometric survey of variable stars in the field of the open cluster NGC 2126. In about one square degree field covering the cluster, a…
Old stellar population synthesis: New age and mass estimates for Mayall II = G1
Jun Ma, Richard de Grijs, Zhou Fan +3
Mayall II = G1 is one of the most luminous globular clusters (GCs) in M31. Here, we determine its age and mass by comparing multicolor photometry with theoretical stellar populatio…
Spectral Energy Distributions and Age Estimates of 39 Globular Clusters in M31
Jun Ma, Zhou Fan, Richard de Grijs +3
This paper supplements Jiang et al. (2003), who studied 172 M31 globular clusters (GCs) and globular cluster candidates from Battistini et al. (1987) on the basis of integrated pho…
Optical Variability of the Radio Source J 1128+5925 -- II. Confirmation of its Optical Quietness
Jianghua Wu, Xu Zhou, Jun Ma +3
The source J 1128+5925 was found recently to show strong intraday variability at radio wavelengths and its radio variability may come from interstellar scintillation. In optical, t…