The colour index a star would have in the absence of interstellar absorption. It is assumed that all stars of the same spectral type and luminosity class have the same intrinsic colour index.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。