期刊
ASTRONOMY & ASTROPHYSICS
卷 618, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201833457
关键词
stars: abundances; stars: atmospheres; stars: Population II; globular clusters: individual: Omega Centauri stars: evolution; stars: evolution
资金
- Fondecyt [1170518]
- Proyecto interno of the Universidad Andres Bello
- STFC [ST/R000484/1, ST/L00061X/1, ST/J001465/1] Funding Source: UKRI
We present Li, Na, Al, and Fe abundances of 199 lower red giant branch star members of the stellar system Omega Centauri, using high-resolution spectra acquired with FLAMES at the Very Large Telescope. The A(Li) distribution is peaked at A(Li) similar to 1 dex with a prominent tail towards lower values. The peak of the distribution well agrees with the lithium abundances measured in lower red giant branch stars in globular clusters and Galactic field stars. Stars with A(Li) similar to 1 dex are found at metallicities lower than [Fe/H] similar to -1.3 dex but they disappear at higher metallicities. On the other hand, Li-poor stars are found at all metallicities. The most metal-poor stars exhibit a clear Li-Na anti-correlation, where about 30% of the sample have A(Li) lower than similar to 0.8 dex, while these stars represent a small fraction of normal globular clusters. Most of the stars with [Fe/H] > -1.6 dex are Li poor and Na rich. The Li depletion measured in these stars is not observed in globular clusters with similar metallicities and we demonstrate that it is not caused by the proposed helium enhancements and/or young ages. Hence, these stars formed from a gas already depleted in lithium. Finally, we note that Omega Centauri includes all the populations (Li-normal/Na-normal, Li-normal/Na-rich, and Li-poor/Na-rich stars) observed, to a lesser extent, in mono-metallic GCs.
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