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2012MNRAS.423.2789D - Mon. Not. R. Astron. Soc., 423, 2789-2799 (2012/July-1)
The chemical composition of nearby young associations: s-process element abundances in AB Doradus, carina-near and Ursa Major.
D'ORAZI V., BIAZZO K., DESIDERA S., COVINO E., ANDRIEVSKY S.M. and GRATTON R.G.
Abstract (from CDS):
The purpose of this work is to investigate the ubiquity of the barium overabundance in young stellar clusters. We analysed high-resolution spectroscopic data, focusing on the s-process elemental abundance for three nearby young associations, i.e. AB Doradus, Carina-Near and Ursa Major. The clusters have been chosen such that their age spread would complement the D'Orazi et al. study.
We find that while the s-process elements Y, Zr, La and Ce exhibit solar ratios in all three associations, Ba is overabundant by ∼0.2 dex. Current theoretical models cannot reproduce this abundance pattern; thus, we investigate whether this unusually large Ba content might be related to chromospheric effects. Although no correlation between [Ba/Fe] and several activity indicators seems to be present, we conclude that different effects could be at work which may (directly or indirectly) be related to the presence of hot stellar chromospheres.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): stars: abundances - open clusters and associations: individual: AB Doradus - open clusters and associations: individual: Carina-Near - open clusters and associations: individual: Ursa Major
Simbad objects: 25
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