恒星自转的测量

The Methods for Measuring Stellar Rotation

本文简述了恒星自转测量的历史,综述了目前世界上使用的几种主要的自转测量方法:包括旋转调制法,视向速度曲线法,谱线轮廓分析法和测光曲线法。对我国在这方面的工作也进行了概述。

The history of the measurement of solar and stellar rotation is described briefly. The basic methods for measuring stellar rotation are reviewed. The methods can be summarized into four kinds. They are. (1) method of rotation modulation, measuring the period changes in brightness or/and in the strength of the emission line, (2) method of measuring the distortion in the radial velocity curves, which is useful for BY Dra, BS CVn, and FK Com type stars, (3) method of analysing the line profile, which is the most important one and with which 90% Vsini are measured, and (4) photometric light curve method.A method for measuring stellar rotation developed by the authors is also given.We obtain the rotation of the program star by means of a comparison between the observed profile of a standard star (nonrotating) convolved with the rotation profile and the observed profile of the program star.