2001/11/13 by Jacco Th. van Loon, van Loon, Jacco Th.
Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0111249
14 pages, includes 11 figures and newpasp.sty (better quality figures 1,2,3 on request from author). In: "Omega Centauri: a unique window into astrophysics", eds. F. van Leeuwen, G. Piotto and J. Hughes. (ASP Conf.Ser.)
arxiv created 2001/11/13 · openalex publication_date 2001/11/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Using the 2dF multi-fibre instrument at the AAT, we have carried out a spectroscopic survey of over 1500 stars brighter than B=16.6 mag, which have been confirmed by the proper motion study of van Leeuwen et al. (2000) to be members of the massive galactic globular cluster, omega Centauri. The survey aimed at sampling the Hertzsprung-Russell Diagram in a uniform way, thus avoiding a bias towards the dominant stellar population and allowing the study of stars with less common properties such as particularly metal-rich or metal-poor stars. Exceptionally, though, emphasis has been given to include as many RR Lyrae variables as possible in order to address the question why these variables are distributed over such a wide observed range in colours -- coinciding with many non-variable stars of similar colours. The potential of the data and analysis are presented together with the first preliminary results.