A Sr-rich Star on the Main Sequence of ω Centauri | Zendy

Laura M. Stanford | Zendy; G. S. Da Costa | Zendy; John E. Norris | Zendy; Russell Can | Zendy

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A Sr-rich Star on the Main Sequence of ω Centauri

Author(s) -

Laura M. Stanford,

G. S. Da Costa,

John E. Norris,

Russell Can

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/510530

Subject(s) - globular cluster , strontium , abundance (ecology) , barium , metallicity , astrophysics , physics , chemistry , stars , inorganic chemistry , biology , fishery , nuclear physics

Abundance ratios relative to iron for carbon, nitrogen, strontium and bariumare presented for a metal-rich main sequence star ([Fe/H]=--0.74) in theglobular cluster omega Centauri. This star, designated 2015448, shows depletedcarbon and solar nitrogen, but more interestingly, shows an enhanced abundanceratio of strontium [Sr/Fe] ~ 1.6 dex, while the barium abundance ratio is[Ba/Fe]<0.6 dex. At this metallicity one usually sees strontium and bariumabundance ratios that are roughly equal. Possible formation scenarios of thispeculiar object are considered.Comment: 13 pages, 3 figures. Accepted to ApJ

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