A search for long period variables in Globular Clusters: M22 and IC4499
arXiv:1401.3755 · doi:10.1017/pasa.2014.3
Abstract
We report on the results of a long time photometric monitoring of the two metal poor Galactic globular clusters M22 and IC4499 searching for long period variables (LPVs) on the upper giant branch. We detected 22 new LPVs in the field of M22 and confirmed the variability of six known variables. Periods could be determined for 16 of them. In the field of IC4499 we detected and characterized 2 new LPVs. Cluster membership is evaluated for all the variables based on photometry and literature data, and the location of the stars in logP-K-diagram is discussed. Our findings give further support to the presence of LPVs at metallicities as low as [Fe/H]=-1.7. The luminosity range where LPVs are found in metal poor clusters is lower than in more metal rich clusters.
10 pages, 5 figures; accepted for publication in PASA
References in corpus (4)
- The Ages of 55 Globular Clusters as Determined Using an Improved delta V_TO^HB Method Along with Color-Magnitude Diagram Constraints, and Their Implications for Broader Issues
- New Radial Abundance Gradients for NGC 628 and NGC 2403
- The RR Lyrae variables and Horizontal Branch of NGC6656 (M22)
- Radial Velocity and Metallicity of the Globular Cluster IC4499 Obtained with AAOmega