The spectral slopes, infrared luminosities and mass loss rates of central stars, as well as the mass loss times from infrared or radio radiation are calculated.

计算了光谱斜率和红外光度，同时从红外及射电幅射得出了中心星质量损失率及质量损失历经时间。

After deriving their effective temperatures and luminosities from their (B-V), (U-B) colors and parallaxes we find their positions in the HR diagram to be mostly confined to the main sequence.

在从样本星的色指数（B -V） ，（U -B）和视差得到它们的有效温度和光度之后，我们发现在赫罗图上它们大多数是位于主序带内的。