A Sr-Rich Star on the Main Sequence of Omega Centauri

Abstract

Abundance 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.

13 pages, 3 figures. Accepted to ApJL

References in corpus (14)

• Towards Better Age Estimates for Stellar Populations: The Y^2 Isochrones for Solar Mixture
• Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-Poor Giants
• Spectroscopic Studies of Extremly Metal-Poor Stars with Subaru/HDS:II.The r-process Elements, Including Thorium
• Multiple Stellar Populations in the Globular Cluster omega Centauri as Tracers of a Merger Event
• The Anglo-Australian Observatory's 2dF Facility
• New evidence for the complex struscture of the RGB of Omega Cen
• The Abundance Spread Among Giants and Subgiants in the Globular Cluster Omega Centauri
• Modelling self-pollution of globular clusters from AGB stars
• Metallicities, relative ages and kinematics of stellar populations in omega Centauri
• High resolution spectroscopy of metal rich giants in omega Cen: first indication of SNe Ia enrichment
• The Evolution of Copper in the Globular Cluster Omega Centauri
• CCD Photometry of the Globular Cluster omega Centauri. II. Stellar Populations and Age-Metallicity Relation
• The extended star formation history of omega Centauri
• The Age and Metallicity Relation of Omega Centauri

Cited by in corpus (5)

• Radial distribution of the multiple stellar populations in omega Centauri
• A spectral atlas of post-main-sequence stars in omega Centauri: kinematics, evolution, enrichment and interstellar medium
• Abundances on the Main Sequence of Omega Centauri
• Abundances of C, N, Sr and Ba on the red giant branch of omega Centauri
• A chemical signature from fast-rotating low-metallicity massive stars: ROA 276 in omega Centauri