133 times of maximum and first ephemeris for the RRc star VZ Draconis.

Details 133 times of maximum and first ephemeris for the RRc star VZ Draconis. 133 times of maximum and first ephemeris for the RRc star VZ Draconis.

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982geocr...3.....f&link_type=abstract

GEOS Circular on RR Lyr Type Variables, No. RR 3, 7 p. (1982)

Physics

Intrinsic Variables, Pulsating Stars, Spectrum Variables, Pulsation Theory

Scientific paper

VZ Draconis is an under-studied variable star, phographic range 12.0 to 12.8 (and not 11.4 to 12.2 as reported erroneously in the GCVS (1969)). The reference given in the GCVS is a paper by L. Meinunger (1961) who classifies VZ Dra as an RR with a 0.47 day period, on the basis of photographic observations made during 6 nights. The first visual observations made by GEOS members in 1975 have led to establish that the period given by Meinunger was erroneous (A. Figer, 1977). Some new observations, more accurate and more numerous, namely 4061 visual estimates by 18 GEOS observers in 1977-78 are discussed here. They have allowed the determination of 133 times of maximum, of standard deviation 0.012 day (that is 17 min). The value for the period has been derived unequivocally and a proper demonstration is given. The corresponding ephemeris (error bars at 95% level of confidence) is: Maximum = hel. JD 2,443,534.7546(+/-33) + 0.3210250(+/-63) E. Finally VZ Dra is an RRc, of the SX UMa type according to the classification by Lange (1960). The M-m value is 0.36. The mean visual range is of the order of 0.5 mag. A detailed analysis of the light curve near maximum (Blazhko effect) would be desirable.

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