Near-infrared observations of RR Lyrae variables in omega Centauri .
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±0.05, and d=5.52±0.13 kpc.
- Publication:
-
Memorie della Societa Astronomica Italiana
- Pub Date:
- 2006
- DOI:
- 10.48550/arXiv.astro-ph/0510174
- arXiv:
- arXiv:astro-ph/0510174
- Bibcode:
- 2006MmSAI..77..330D
- Keywords:
-
- globular clusters: individual (omega Centauri)-stars: variables:other;
- Astrophysics
- E-Print:
- 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