The Rotation of Sub-Populations in omega Centauri

Details The Rotation of Sub-Populations in omega Centauri The Rotation of Sub-Populations in omega Centauri

2007-04-23

arxiv.org/abs/0704.2962v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 fiures, electronic table can be obtained from E. Pancino. Accepted for publication in ApJ Letters

Scientific paper

10.1086/518959

We present the first result of the Ital-FLAMES survey of red giant branch (RGB) stars in omega Cen. Radial velocities with a precision of ~0.5 km/s are presented for 650 members of omega Cen observed with FLAMES-Giraffe at the Very Large Telescope. We found that stars belonging to the metal -poor (RGB-MP), metal-intemediate (RGB-MInt) and metal-rich (RGB-a) sub -populations of Omega Cen are all compatible with having the same rotational pattern. Our results appear to contradict past findings by Norris et al., who could not detect any rotational signature for metal -rich stars. The slightly higher precision of the present measurements and the much larger sample size, especially for the metal-richer stars, appear as the most likely explanation for this discrepancy. The result presented here weakens the body of evidence in favour of a merger event in the past history of omega Cen.

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