Deep FORS1 observations of the double Main Sequence of omega Centauri

Details Deep FORS1 observations of the double Main Sequence of omega Centauri Deep FORS1 observations of the double Main Sequence of omega Centauri

2006-09-25

arxiv.org/abs/astro-ph/0609650v1

Astrophys.J.654:915-922,2007

Astronomy and Astrophysics

Astrophysics

15 pages, 10 figures, accepted for publication by ApJ

Scientific paper

10.1086/509711

We present the results of a deep photometric survey performed with FORS1@VLT aimed at investigating the complex Main Sequence structure of the stellar system omega Centauri. We confirm the presence of a double Main Sequence and identify its blue component (bMS) over a large field of view up to 26' from the cluster center. We found that bMS stars are significantly more concentrated toward the cluster center than the other "normal" MS stars. The bMS morphology and its position in the CMD have been used to constrain the helium overabundance required to explain the observed MS morphology.

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