An Advance for The Method Measured Rotation

An advance proposal for the rotational measurement method realized by Tan Huisong (1985) and Tomkin and Tan (1985) is suggested. In this improvement, the rotation may be Obtained by the way of complete numerical procedure. Four adjustable parameters, scale of intensity k, rotation Vsin i, limb darkening ε, and shift along the line of wavelength s, are emploied. From these parameters, the radial velocity and the chemical composition may be obtained.This way would be quicker and more accurate than before.