Radial velocities of 643 DA white dwarfs

Close double degenerate binaries are one of the favoured progenitor channels for type Ia supernovae, but it is unclear how many suitable systems there are in the Galaxy. We...密近简并双星（Close double degenerate binaries）是Ia型超新星（type Ia supernovae）最受青睐的前身天体通道之一，但目前尚不清楚银河系（Galaxy）中存在多少个符合条件的此类系统。我们...