Reddening distribution across the center of the globular cluster Omega Centauri

Details Reddening distribution across the center of the globular cluster Omega Centauri Reddening distribution across the center of the globular cluster Omega Centauri

2005-10-12

arxiv.org/abs/astro-ph/0510343v1

Astrophys.J.634:L69-L72,2005

Astronomy and Astrophysics

Astrophysics

5 figures, accepted for publication by ApJ Letters

Scientific paper

10.1086/498691

We present new medium-band uvby Stromgren and broad-band VI photometry for the central regions of the globular cluster Omega Cen. From this photometry we have obtained differential reddening estimates relative to two other globular clusters (M13 and NGC288) using a metallicity-independent, reddening-free temperature index, [c]=(u-v)-(v-b) - 0.2(b-y), for hot horizontal-branch (HB) stars (T_e> 8,500K). We estimate color excesses of these hot HB stars using optical and near-infrared colors, and find clumpy extinction variations of almost a factor of two within the area of the cluster core. In particular, the greatest density of more highly reddened objects appears to be shifted along the right ascension axis when compared with less reddened ones. These findings complicate photometric efforts to investigate the star formation history of Omega Cen.

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