arXiv subjects
Publications and source records attributed to Z. Kadla.
A preliminary analysis of the UBV light curves of RR AB variables revealed that they contain information on the metallicities of these stars. The computed parameters which correlate with metallicity are given in the tables for 99 RR AB stars including 12 variables without previously determined metallicities.
An analysis of available Galactic globular cluster data on metallicity, ages, the distribution of stars on the horizontal branch and the distribution of the periods of RR0 Lyr variables showed that: 1. The latter two characteristics can be used for determining the Oosterhoff type. 2. The metallicities of the observed OoI and OoII clusters overlap in a narrow interval -1.65$<$[Fe/H]$<$1.52. 3. The OoII clusters are characterized by R-B$<$0, a statistically significant relation (r=0.97) between the relative number of B(BS) and V(VS) stars on the horizontal branch. 4. The OoI clusters divide into two groups: R-B$<$0 and R-B$>$0 with a relation between B and R (r=0.90). The former clusters do not show a relation between VS and RS stars and the latter a relation between VS and BS stars on the horizontal branch. 5. The oldest clusters are characterized by BS close to 1 and the youngest by R close to 1.