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Abstract

The classification of star clusters as “open” or “globular” was originally based on their appearance in the sky. However, in the Milky Way Galaxy, the common properties of open clusters (location in the galactic disk, disk kinematics, near solar metallicity, and younger age) are fairly distinct from the properties of globular clusters (often in the galactic spheroid, often metal-poor, older age). Here we designate clusters with ages 10 Gyr and younger as “open” and older clusters as “globular.” However, cases of ambiguous or inadequate data exist (e.g., for clusters Berkeley 17, Pal 1, BH176, Lynga 7, see tables below), and there is no single rigorous definition that can be used to classify every star cluster.

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Harris, H.C., Harris, W.E. (2002). Star Clusters. In: Cox, A.N. (eds) Allen’s Astrophysical Quantities. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-1186-0_22

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  • DOI: https://doi.org/10.1007/978-1-4612-1186-0_22

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