Spectral-luminosity classification, colour variations and suspected Beta Canis Majoris-type variability in IZ Persei

Abstract

The colour indices and the spectrum-luminosity of the eclipsing binary system IZ Persei have been presented for the first time. The colour indices of the system appear reddened. Applying the interstellar reddening corrections, the spectral-luminosity classes of the primary and the secondary components of IZ Per come out to be B2.5III-V and B5III-V, respectively. The average B-V and U-B colour excesses come out to be 0.ͫ4 and 0.ͫ2, respectively. The colour indices show continuous variation throughout the cycle, and indicate the presence of intrinsic variability. Tentative analysis suggest that the primary component of IZ Per is a Beta Canis Majoris-type variable. The possibility of a shell has also been discussed.