Photometry of RR Lyrae variables in the globular clusters M5 and M92

Astronomy and Astrophysics – Astronomy

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Globular Clusters, Infrared Photometry, Variable Stars, Visual Photometry, Light Curve, Metallicity

Scientific paper

The study presents visual photometry at V and i obtained for five RR Lyrae variables in the extremely metal-poor global cluster M92 and eight in the cluster M5, of intermediate metallicity, for use in a Baade-Wesselink analysis. The periods of these variables are updated by combining observations of the current epoch with older data from the literature. Mean magnitudes are derived from the light curves. IR photometery and J and K are also obtained for two RR Lyrae variables in M92 and for four variables in the cluster M5. Preliminary distance determinations using the (MV)-(Fe/H) relationship from the literature are derived as 14.48 +/- 0.04 for M92 and 14.25 +/- 0.05 for M5, while preliminary distance determinations using the (MK)-log(P) relationship are derived as 0.15 mag smaller.

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