Effects of stellar rotation on spectral classification
Effects of stellar rotation on spectral classification
复制标题
恒星自转对光谱分类的影响
DOI：
10.1086/158453
复制
发表时间：
1980
期刊：
影响因子：
--
通讯作者：
Thomas J. Kuzma
中科院分区：
文献类型：
--
作者：
Arne Slettebak;Thomas J. Kuzma
由于平板分辨率的影响以及旋转恒星大气的物理变化，恒星旋转可能会影响光谱分类所用谱线的强度。在第一种情况下，强调了使用具有适当旋转线展宽的标准恒星对相对高色散（分辨率）光谱进行分类的重要性。一般来说，对弱谱线和巴尔默谱线的旋转效应可能会导致光谱类型和光度等级分配的系统误差，除非选择的标准恒星的谱线宽度与待分类恒星的谱线宽度相似。关于旋转大气中的物理变化，我们扩展了Collins的早期工作，包括Balmer谱线和He I和Si II谱线，这些谱线在更广泛的光谱类型的光谱分类中很重要。
Stellar rotation may affect the strengths of lines used in spectral classification because of effects of plate resolution and also because of physical changes in the rotating stellar atmospheres. In the first case, the importance of using standard stars with appropriate rotational line broadening in classifying spectra of relatively high dispersion (resolution) is emphasized. Rotational effects on weak lines in general and on the Balmer lines may cause systematic errors in the assignment of spectral types and luminosity classes unless the standard stars are chosen with line broadening similar to that of the star to be classified. With regard to physical changes in the rotating atmospheres, we have extended the earlier work of Collins to include the Balmer lines plus additional lines of He I and Si II which are important in spectral classification over a wider range of spectral types.