摘要
讨论了恒星临边昏暗在恒星角直径测量中的影响．研究表明，相对于二项式近似而言，ＵＤ模型和线性模型均对恒星角直径测量有所低估，在线性临边昏暗系数较小时，这种影响最大， ＵＤ和线性近似与二项式近似的差别最多分别达 ２５．５％和 １２．６％；而在线性系数值趋近于１时，其相互差别随之可以忽略．而新旧线性临边近似之间对于恒星角直径测量的影响似乎并不很大．最后我们认为非线性临边昏暗效应的影响不可忽略．
In this paper the influence of the limb-darkening effects on stellar angular diameter measurement were studied. It shows that both UD and linear results underestimate the value of angular diameter; the difference is larger at stronger limb-darkening effects (c0 - 0), the largest difference among UD, linear result and quadric approach are 25.5%, 12.6% respectively. While their differences can be ignored when co tended to one. However, the difference between new and old linear approach seems small, it thinks that the quadric limb-darkening effects should be considered in the measurement of the stellar angular diameter.
出处
《空间科学学报》
CAS
CSCD
北大核心
2000年第4期303-309,共7页
Chinese Journal of Space Science
关键词
恒星大气
恒星
角直径测量
临边昏暗
Stellar atmosphere, Stellar limb-darkening approach, Stellar angular diameter measurement
