COMMUNICATIONS / MITTEILUNGEN
Period Changes in Dwarf Cepheids, III
SZ Lyncis
No. 84
Budapest, 1983
Abstract
2371 photoelectric UBV observations obtained between 1962 and 1979 and twelve
radial velocity measurements made in 1971 are reported. The long-periodic
variation in time of maximum light discovered by van Genderen has been
confirmed and the values of its period (P1= 1170 days = 3.20 yr) and
semiamplitude (A = 0.00540 day = 467 sec) were improved. A secular change in
the pulsation period (B = 10-12 day cycle-1) has been found Small
cycle-to-cycle variations are clearly seen but a search for periodic modulation
failed. The photometric parameters of the light curves are discussed. The
two-colour diagram of SZ Lyn suggests an interstellar reddening of E(B-V) =
0.04 magn. Our spectra do not show any feature of the presence of doubled
lines. Our observations are compatible with the hypothesis that SZ Lyn is a
single-lined spectroscopic binary with a period of 3.20 yr and a total
velocity amplitude 18 km s-1.
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