Very low mass stars in Praesepe

Determination of the mass functions of open clusters of different ages allows us to infer the efficiency with which brown dwarfs are evaporated from clusters to populate the...对不同年龄疏散星团（open clusters）的质量函数（mass functions）进行测定，可用于推断褐矮星（brown dwarfs）从星团中蒸发脱离并填充……的效率。