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24 April 2024
 
  » arxiv » astro-ph/0611509

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A Sr-Rich Star on the Main Sequence of Omega Centauri
Laura M. Stanford ; G. S. Da Costa ; John E. Norris ; Russell D. Cannon ;
Date 16 Nov 2006
AbstractAbundance ratios relative to iron for carbon, nitrogen, strontium and barium are presented for a metal-rich main sequence star ([Fe/H]=--0.74) in the globular cluster omega Centauri. This star, designated 2015448, shows depleted carbon and solar nitrogen, but more interestingly, shows an enhanced abundance ratio 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 barium abundance ratios that are roughly equal. Possible formation scenarios of this peculiar object are considered.
Source arXiv, astro-ph/0611509
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