Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-05-13
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted for publication in the ApJ
Scientific paper
We present manganese abundances in 10 red-giant members of the globular cluster Omega Centauri; 8 stars are from the most metal-poor population (RGB MP and RGB MInt1) while two targets are members of the more metal rich groups (RGB MInt2 and MInt3). This is the first time Mn abundances have been studied in this peculiar stellar system. The LTE values of [Mn/Fe] in Omega Cen overlap those of Milky Way stars in the metal poor Omega Cen populations ([Fe/H] ~ -1.5 to -1.8), however unlike what is observed in Milky Way halo and disk stars, [Mn/Fe] declines in the two more metal-rich RGB MInt2 and MInt3 targets. Non-LTE calculations were carried out in order to derive corrections to the LTE Mn abundances. The non-LTE results for Omega Cen in comparison with the non-LTE [Mn/Fe] versus [Fe/H] trend obtained for the Milky Way confirm and strengthen the conclusion that the manganese behavior in Omega Cen is distinct. These results suggest that low-metallicity supernovae (with metallicities < -2) of either Type II or Type Ia dominated the enrichment of the more metal-rich stars in Omega Cen. The dominance of low-metallicity stars in the chemical evolution of Omega Cen has been noted previously in the s-process elements where enrichment from metal-poor AGB stars is indicated. In addition, copper, which also has metallicity dependent yields, exhibits lower values of [Cu/Fe] in the RGB MInt2 and MInt3 Omega Cen populations.
Bergemann Maria
Cunha Katia
Lambert David L.
Smith Verne V.
Suntzeff Nicholas B.
No associations
LandOfFree
Manganese Abundances in the Globular Cluster Omega Centauri does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Manganese Abundances in the Globular Cluster Omega Centauri, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manganese Abundances in the Globular Cluster Omega Centauri will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-641103