Shemakha Astrophysical ObservatoryWith 12 figures (Received 1979 .\ugust I ) Ten-colour photoelectric observations are presented for twelve Ap-stars. Improved ephemeris for seven of them is given. Phase relations between the light curves and line intensity variations are discussed. The problem of thc electromagnetic flux conctancy of IOTA Cas is approached from a qualitative point of view.
Lichtelektrische Untersuchungen von sieben Ap,Sternen -Mitgliedern von spektroskopischen Doppelstemsystemen B. MUSIELOK, E. ZELWANOWA, W. SCHONEICH und G. HILDEBRANDT, Potsdam Z e n t r a l i n s t i t u t ftir Astrophysik der AdW d e r DDR Mit 8 hbbildungen. (Eillgegallgen 1975 O k t o k r 3) Es wird liber die vorlaufigcn Ergebnisse einer B, V Photometric von sieben Ap-Komponenten spektroskopischcr Doppelsterne bcrichtet. In allen Fiillen ist die Amplitude Weiner als 0.025 mag.. For keincs diescr Systeme konnte eine synchrone Rotation des ApSterns mit der Bahnperiode nachgewiesen werden. Preliminary results are given for seven Ap components of spectroscopic double stars in the B, V system.In all cases the amplitudes are smaller than 0.025 mag.. For no system of these Seven Ap stars there was found a light variation with the pcriod of the orbit.
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