Spatial metallicity asymmetry in $ω$ Centauri

Details Spatial metallicity asymmetry in $ω$ Centauri Spatial metallicity asymmetry in $ω$ Centauri

1998-08-28

arxiv.org/abs/astro-ph/9808327v1

Astronomy and Astrophysics

Astrophysics

9 pages, 4 Postscript figures, accepted for publication in ApJ Letters

Scientific paper

10.1086/311648

The compilation of the metallicity values of $\omega$~Centauri stars led to detection of spatial asymmetry in the metallicity distribution of the bright giants. It was found that the most and least metal-poor objects are separated along galactic latitude. Statistical tests show that the chance occurrence of the phenomenon is very low. The subgiant and the RR~Lyrae samples do not show, however, similar segregation of the different metallicity objects. The physical parameters of the variables calculated by using empirical formulae indicate that the bulk of the RRab stars comprises a very homogeneous group regarding both their metallicity and mass values. These stars are most probably already in the evolved stage of their horizontal branch evolution.

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