标题： 棕矮星对银河系局部质量预算的贡献 显示英文标题

标题： The contribution of brown dwarfs to the local mass budget of the Galaxy

摘要： 基于最近发现的自由漂浮棕矮星，我们推导了这一类天体的局部质量密度估计值。 来自不同调查的质量密度估计值范围为0.03至0.005 M_Sun/pc^3。 这些估计值与其他银河系盘状结构成分的局部质量密度进行了比较，特别是与动态确定的总局部质量密度进行了比较。 我们认为棕矮星确实可能对局部质量预算做出显著贡献，但如Ruiz等人(1997)所建议的0.03 M_Sun/pc^3的局部质量密度则不太可能。 显示英文摘要

摘要： Based on the recent discoveries of free floating brown dwarfs we derive estimates of the local mass density of this population of objects. Mass density estimates from various surveys span the range 0.03 to 0.005 M_Sun/pc^3. These estimates are compared with the local mass densities of the other constituents of the galactic disk and, in particular, with the dynamically determined total local mass density. We argue that brown dwarfs might indeed contribute significantly to the local mass budget, but that a local mass density as high as 0.03 M_Sun/pc^3 as suggested by Ruiz et al. (1997) is rather unlikely.