SPECTRUM OF BP STAR HD-36916

The spectrum of the peculiar Bp star HD 36916 has been studied on plates with dispersion 9.7 A/mm and compared with those of η Aur, B3V and i And, B8V. A comparison of the observed contours of Hβ, Hγ and of the Balmer discontinuity D with those computed by Mihalas gives the following results: HD 36916: θe=0.347, log g=3.8;i And: θe=0.383, log g=3.2; η Aur: θe=0.302, log g=3.6. HD 36916 presents the characteristics of the Si-λ4200 stars: strong deficiency in helium and probably also in oxygen and nitrogen, strong excess of silicon and strontium; 3984 Hg ii is present. Moreover this star also has characteristics which are not common to Si-λ4200 stars but rather to Mn stars: excess by a factor of ten of the elements of the iron group and an excess larger, probably of the order of 100, for manganese. The star is a member of the Sword subgroup of the Orion association. © 1969 D. Reidel Publishing Company.