论文标题
从宇宙动力学的角度观察的空间中选择性吸收光的问题
The question of selective absorption of light in space viewed from the viewpoint of the dynamics of the universe
论文作者
论文摘要
空间中的选择性光吸收已在天文学文献中提高。产生吸收的物质必须具有一定的质量。因此，问题是它有多大。假设它可以用扁平的旋转椭圆形表示，我们开发了银河系系统的动态模型。我们使用$δ$ -Cephei和Algol型变量星的空间分布，根据Campbell的平均速度来计算Sun附近银河系的动态密度，$ 0.100 \，M_ \ odot/PC^3 $。我们发现，动态密度等于太阳附近恒星的平均密度。我们的结论是，恒星的固有引力完全解释了它们的运动，并且任何其他物质的存在似乎都不太可能。因此，除非有人承认在粒子空间中的存在远小于我们所知的元素的原子，否则显着的选择性吸收的存在似乎绝对不可能。如果颗粒直径为毫米或更少，并且它们的质量相对较小，则可能存在正常的吸收。这种吸收尚未可靠地检测到。如果在空间中恒星均匀分布的情况下，恒星数量随恒星幅度的增加而增加的事实可以通过光吸收和距离恒星数量减少。
The selective light absorption in space has been raised in astronomical literature. The substance producing the absorption must have some mass; thus the question is how large it is. We develop a dynamical model of the Milky Way system, assuming that it can be represented by a flattened ellipsoid of rotation. We use the spatial distribution of $δ$-Cephei and Algol type variable stars, and mean velocities of stars according to Campbell to calculate the dynamical density of the Milky Way near the Sun, $0.100\,M_\odot/pc^3$. We find that the dynamical density is equal to the mean density of stars in the vicinity of the Sun. Our conclusion is that the intrinsic gravity of stars fully explains their motion, and the existence of any other matter in any significant quantity seems unlikely. Therefore, the existence of noticeable selective absorption seems to be absolutely improbable, unless one admits the existence in the space of particles much smaller than atoms of elements known to us. Normal absorption may exist if the particle diameter is of the order of a millimetre or less, and their mass is comparatively small. This absorption has not yet been reliably detected; the fact that the number of stars increases with stellar magnitude more slowly than theory requires in case of uniform distribution of stars in space, can be equally explained by both light absorption and decrease in number of stars with distance.
