Determination of the strengths of doubled lines by the method of equivalent widths

Abstract

A technique for the measurement of line strengths of doubled lines using the equivalent width method is developed. The line profile is represented by the Voigt function and the prototype doubling is the lambda doubling in NO. The lambda doubling is incorporated into the algorithm for the theoretical calculations of the equivalent widths. The dependence of the equivalent width on the half width at half intensity, the line strength and splitting is demonstrated. Comparisons of the Voigt, Lorentz and Doppler function properties are included.