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- W2077899327 abstract "We present radial velocities and Fe and Al abundances for 180 red giant branch (RGB) stars in the Galactic globular cluster Omega Centauri (ω Cen). The majority of our data lie in the range 11.0 < V < 13.5, which covers the RGB from about 1 mag above the horizontal branch to the RGB tip. The selection procedures are biased toward preferentially observing the more metal-poor and luminous stars of ω Cen. Abundances were determined using equivalent width measurements and spectrum synthesis analyses of moderate resolution spectra (R ≈ 13,000) obtained with the Blanco 4 m telescope and Hydra multifiber spectrograph. Our results are in agreement with previous studies as we find at least four different metallicity populations with [ Fe/H ] = − 1.75, –1.45, –1.05, and –0.75, with a full range of –2.20≲ [ Fe/H ] ≲ − 0.70. [Al/Fe] ratios exhibit large star-to-star scatter for all populations, with the more than 1.0 dex range of [Al/Fe] decreasing for stars more metal-rich than [ Fe/H ] ∼ − 1.4. The minimum [Al/Fe] abundance observed for all metallicity populations is [ Al/Fe ] ∼ + 0.15. The maximum abundance of log (Al) is reached for stars with [ Fe/H ] ∼ − 1.4 and does not increase further with stellar metallicity. We interpret these results as evidence for Type II SNe providing the minimum [Al/Fe] ratio and a mass spectrum of intermediate-mass asymptotic giant branch stars causing the majority of the [Al/Fe] scatter. These results seem to fit in the adopted scheme that star formation occurred in ω Cen over >1 Gyr." @default.
- W2077899327 created "2016-06-24" @default.
- W2077899327 creator A5024199589 @default.
- W2077899327 creator A5032840757 @default.
- W2077899327 creator A5062307919 @default.
- W2077899327 creator A5077928427 @default.
- W2077899327 date "2008-07-10" @default.
- W2077899327 modified "2023-09-25" @default.
- W2077899327 title "Fe and Al Abundances for 180 Red Giants in the Globular Cluster Omega Centauri (NGC 5139)" @default.
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