Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....51..239a&link_type=abstract
Astronomy and Astrophysics, vol. 51, no. 2, Sept. 1976, p. 239-245. In French.
Astronomy and Astrophysics
Astrophysics
2
Cepheid Variables, Globular Clusters, Statistical Analysis, Stellar Evolution, Astronomical Maps, Physical Properties, Star Distribution, Stellar Rotation
Scientific paper
The period-amplitude diagrams of RR Lyrae stars in 12 globular clusters were statistically analyzed in order to investigate possible causes for the Oosterhoff effect, which reveals itself in the fact that globular clusters divide into two groups with average rotation periods of their RR Lyrae members pulsating in the fundamental mode of 0.55 and 0.65 days, respectively. The statistical method of Bijaoui was used, which reveals not only differences in the star distributions in the period-amplitude diagram between the two groups, but also among clusters of the same group. While the properties of the RR Lyrae in both groups were fairly homogeneous, significant dispersion was observed which may be due to either dispersion of physical properties or an evolution effect, namely, that the clusters of a same group are observed through the intermediary of these variable stars at different stages of evolution.
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