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arXiv:astro-ph/0402100 (astro-ph)
[Submitted on 4 Feb 2004]

Title:IR photometric properties of Red Giants in omega Cen

Authors:A. Sollima, F.R. Ferraro, L. Origlia, E. Pancino, M. Bellazzini
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Abstract: We present a near-infrared J and K photometric catalog containing more than 73,000 stars in the central region of the giant Globular Cluster omega Centauri. This is the largest IR data-set ever published for this cluster and has been used to completely characterize the morphology and the properties of the Red Giant Branch (RGB). In particular, we concentrated our attention on (i) the anomalous RGB (RGB-a), recently discovered in this cluster and (ii) the RGB of the dominant metal poor population (RGB-MP) in both the infrared (K,J-K) and optical-infrared (K,V-K) color magnitude diagrams. The full set of morphological parameters and photometric indices has been measured and compared with the empirical relations by Ferraro et al. (2000). We find that the detailed photometric properties of the RGB-a are in full agreement with the recent spectroscopic metallicity estimates, that place it at the metal-rich extreme of the stellar population mix in omega Centauri.
Comments: 10 pages, 14 figures, submitted to A&A
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0402100
  (or arXiv:astro-ph/0402100v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0402100
Journal reference: Astron.Astrophys. 420 (2004) 173-181
Related DOI: https://doi.org/10.1051/0004-6361%3A20035634

Submission history

From: Antonio Sollima [view email]
[v1] Wed, 4 Feb 2004 14:33:07 UTC (217 KB)
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