2. Photometric measurements of magnetic-field and Spectrum variables

Extract

In Heidelberg photo-electric measurements have been made on the spectrum variables ι Cassiopeiae, 73 Draconis, γ Equulei, χ Serpentis, є Ursae Majoris, BD + 33^° 1008 and others. According to our results all of these stars are variable with an amplitude of 0.01 magnitude and period equal to that of the spectral variability. Mr Bahner has carried out some further spectrophotometrical measurements of the line intensities in the spectra of ι Cassiopeiae, χ Serpentis and є Ursae Majoris. These measurements have enabled him to determine the phase relationship between the total light and line variations. The magnetic-field variable HD 133129 is likewise variable in magnitude with a small amplitude. The period, which might be several days long, could not as yet be determined with certainty.