Near-Infrared Observations of RR Lyrae Variables in $\omega$ Centauri

A.M. Piersimoni; F. Caputo; G. Bono; J. Storm; L.M. Freyhammer; M. Del Principe; M. Marconi; P.B. Stetson; S. Cassisi

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Near-Infrared Observations of RR Lyrae Variables in $\omega$ Centauri

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arxiv astro-ph/0510174 v1 pith:LSXDWTDY submitted 2005-10-06 astro-ph

M. Del Principe , A.M. Piersimoni , J. Storm , G. Bono , F. Caputo , S. Cassisi , L.M. Freyhammer , M. Marconi

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P.B. Stetson

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classification astro-ph

keywords clusterdistancelyraenear-infraredobservationsomegarelationsagree

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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 $\mu = 13.71\pm0.05$, and $d=5.52\pm0.13$ kpc.

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