The variability of γ-ray sources listed in the third EGRET catalog is studied using three variability indices. These indices are found to be statistically equi
<正>Similar to the case of pulsars the magnetic axis and the spin axis of gamma-ray burst sources may not lie on the same line. This may cause the formation of
In a previous paper, we proposed another special critical value concerning the evolution of the long period family around the equilateral equilibrium points, be
We performed an extensive non-LTE analysis of the neutral sodiumlines of Na I 5683/5688, 5890/5896, 6154/6161, and 8183/8195 in disk/halo starsof types F-K cove