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14 October 2024

» arxiv » astro-ph/0510174

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Near-Infrared Observations of RR Lyrae Variables in $omega$ Centauri
M. Del Principe ; A.M. Piersimoni ; J. Storm ; G. Bono ; F. Caputo ; S. Cassisi ; L.M. Freyhammer ; M. Marconi ; P.B. Stetson ;
Date:	6 Oct 2005
Subject:	astro-ph
Abstract:	We present Near-Infrared (NIR) $J$ and $K_s$-band observations for 181 RR Lyrae stars in the Galactic Globular Cluster $omega$ Cen. The comparison between predicted and empirical slopes of NIR Period-Luminosity (PL) relations indicates a very good agreement. Cluster distance estimates based on NIR PL relations agree quite well with recent determinations based on different standard candles, giving a true mean distance modulus $mu = 13.71pm0.05$, and $d=5.52pm0.13$ kpc.
Source:	arXiv, astro-ph/0510174
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