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

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

Astrophysics 2007-05-23 v1

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

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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.

Keywords

RR Lyrae variables near-infrared observations Period-Luminosity relation distance modulus omega Centauri

Cite

@article{arxiv.astro-ph/0510174,
  title  = {Near-Infrared Observations of RR Lyrae Variables in $\omega$ Centauri},
  author = {M. Del Principe and A. M. Piersimoni and J. Storm and G. Bono and F. Caputo and S. Cassisi and L. M. Freyhammer and M. Marconi and P. B. Stetson},
  journal= {arXiv preprint arXiv:astro-ph/0510174},
  year   = {2007}
}

Comments

2 pages, 1 figure, to appear in the proceedings of the Workshop "Stellar Pulsation and Evolution", 2005. Monte Porzio Catone, Italy. Eds.: A.R. Walker and G. Bono

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

Abstract

Keywords

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