COMMUNICATIONS / MITTEILUNGEN
Period changes of bright southern Cepheids
No. 94 (Vol. 11, Part 1)
Budapest, 1989
Abstract
O-C diagrams have been constructed for 44 bright southern Cepheids, mainly
for studying the effects of duplicity on the pulsation period. Because
the light-time effect in the O-C diagrams of binary Cepheids has to be
accompanied with properly phased variations in the gamma-velocity, the
radial velocities of the programme stars have been studied, as well.
Light-time effect is found or suspected in eleven cases (V946 Aql, AX Cir,
AG Cru, BG Cru, BF Oph, AP Pup, AT Pup, Y Sgr, AP Sgr, R TrA and V Vel),
and a preliminary value of the orbital period is suggested for 14
Cepheid binaries (V946 Aql, AX Cir, AG Cru, Y Oph, BF Oph, AP Pup, AT Pup,
U Sgr, Y Sgr, AP Sgr, BB Sgr, RV Sco, R TrA and V Vel). The phenomenon of
the phase jump (i.e. the return of the pulsation period to an earlier
value) is present in the O-C diagram of eight binaries (U Aql, YZ Car,
KN Cen, S Mus, S Nor, Y Oph, U Sgr and V350 Sgr).
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