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Open cluster remnant : ウィキペディア英語版 | Open cluster remnant
In astronomy, an open cluster remnant (OCR) is the final stage in the evolution of an open star cluster. == Theory ==
Viktor Ambartsumian (1938) and Lyman Spitzer (1940) showed that, from a theoretical point of view, it was impossible for a star cluster to evaporate completely; furthermore, Spitzer pointed out two possible final results for the evolution of a star cluster: evaporation provokes physical collisions between stars, or evaporation proceeds until a stable binary or higher multiplicity system is produced.
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