A Study of the Spectrum and Magnetic Variable Star HD 125248

Abstract

The relationship between variability in line intensity, radial velocity, magnetic field, and luminosity of HD 125248 is examined. Using the period 9.295 days given by Deutsch for the spectrum changes, the radial velocity measurements made by Morgan in 1931 are analysed. These measurements suggest a radial velocity variation of approximate amplitude 13 km./sec. with zero velocity when the Eu II lines have their maximum intensity. Thus the velocity zeros occur when the magnetic field variation discovered by Babcock has its extreme values. Photometric measurements leading to the light curve of the star are described. An harmonic analysis shows the light variation to be symmetrical about the maximum, the first and second harmonics being the principal terms. The elements of the light variation are