COMMUNICATIONS / MITTEILUNGEN
Northern Cepheids: Period Update and Duplicity Effects
No. 96 (Vol. 11, Part 3)
Budapest, 1991
Abstract
O-C diagrams have been continued for 64 northern Cepheids with the
primary aim of 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 velocity of the programme stars has been studied, as well.
Light-time effect is suspected in the O-C diagram of FM Aql, RW Cam, Y Lac
and RS Ori, and confirmed for AW Per. One or more phase jumps are present
or suspected in the O-C diagram of 19 northern Cepheids (FF Aql, BY Cas,
DD Cas, DL Cas, X Cyg, SU Cyg, SZ Cyg, DT Cyg, V532 Cyg, V924 Cyg, TX Del,
DX Gem, X Lac, CV Mon, RS Ori, SV Per, SZ Tau, T Vul, X Vul). In addition
to the Cepheids with known spectroscopic orbit, the spectroscopic binary
nature based on the variability of the gamma-velocity has been confirmed,
revealed or suspected for the majority of the programme stars. The most
probable new spectroscopic binary Cepheids are: KL Aql, Eta Aql, SU Cas,
V636 Cas, BZ Cyg, MW Cyg, V386 Cyg, W Gem, RZ Gem, AD Gem, RS Ori, SV Per,
SW Tau, T Vul and U Vul. A preliminary value of the orbital period is
suggested for Eta Aql, SU Cas, RZ Gem, T Vul and U Vul.
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