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arXiv:astro-ph/0403112 (astro-ph)
[Submitted on 4 Mar 2004]

Title:Omega Centauri: The Population Puzzle Goes Deeper

Authors:L. R. Bedin (1), G. Piotto (1), J. Anderson (2), S. Cassisi (3), I. R. King (4), Y. Momany (1), G. Carraro (1). ((1) Dipartimento di Astronomia, Universita` di Padova, ITALY; (2) Department of Physics and Astronomy, Rice University, USA; (3) Osservatorio Astronomico Collurania, ITALY; (4) Astronomy Department, University of Washington, USA)
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Abstract: We present HST observations that show a bifurcation of colors in the middle main sequence of the globular cluster Omega Centauri. We see this in three different fields, observed with different cameras and filters. We also present high precision photometry of a central ACS field which shows a number of main-sequence turnoffs and subgiant branches. The double main sequence, the multiple turnoffs and subgiant branches, and other population sequences discovered in the past along the red giant branch of this cluster add up to a fascinating but frustrating puzzle. We suggest various explanations, none of them very conclusive.
Comments: A_fine_piece_of_work: 12 pages, 2 figures, ApJL_ACCEPTED_, 4 March 2004; high resolution version of the paper available at: this ftp URL
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0403112
  (or arXiv:astro-ph/0403112v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0403112
Journal reference: Astrophys.J.605:L125-L128,2004
Related DOI: https://doi.org/10.1086/420847

Submission history

From: Luigi Rolly Bedin [view email]
[v1] Thu, 4 Mar 2004 17:18:35 UTC (213 KB)
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