Variable Stars in Galactic Globular Clusters

By C. Clement, A. Muzzin, Q. Dufton, Thivya Ponnampalam, John Wang, J. Burford, A. Richardson, Tara Rosebery, J. Rowe, Helen Sawyer Hogg. 2001

328 citations recorded by the source corpus.

Based on a search of the literature up to 2001 May, the number of known variable stars in Galactic globular clusters is approximately 3000. Of these, more than 2200 have known periods and the majority (approximately 1800) are of the RR Lyrae type. In addition to the RR Lyrae population, there are approximately 100 eclipsing binaries, 120 SX Phoenicis variables, 60 Cepheids (including Population II Cepheids, anomalous Cepheids and RV Tauri), and 120 SR/red variables. The mean period of the fundamental mode RR Lyrae variables is 0.585 days, for the overtone variables it is 0.342 days (0.349 days for the first-overtone pulsators and 0.296 days for the second-overtone pulsators) and approximately 30% are overtone pulsators. These numbers indicate that about 65% of RR Lyrae variables in Galactic globular clusters belong to Oosterhoff type I systems. The mean period of the RR Lyrae variables in the Oosterhoff type I clusters seems to be correlated with metal abundance in the sense that the periods are longer in the more metal poor clusters. Such a correlation does not exist for the Oosterhoff type II clusters. Most of the Cepheids are in clusters with blue horizontal branches.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/5f3d33b62f9a9239c0b8c1e0867144073214ba82

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In Astronomy and Astrophysics

Citations in the corpus

A Multicolor and Fourier Study of RR Lyrae Variables in the Globular Cluster NGC 5272 (M3) (2004, result): “This is of course just a rough estimate, but quite consistent with the observational evidence (cf. Clement et al. 2001).”
The second and third parameters of the horizontal branch in globular clusters (2010, unknown): “These last two values are from Clement et al. (2001).”