The Mg-K Anticorrelation in ω Centauri

Deimer Antonio Alvarez Garay

doi:10.3847/2041-8213/ac5ccf

2022-03-28

Deimer Antonio Alvarez Garay *

DOI：10.3847/2041-8213/ac5ccf

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We present [K/Fe] abundance ratios for a sample of 450 stars in omega Centauri, using high-resolution spectra acquired with the multiobject spectrograph FLAMES@VLT. Abundances for Fe, Na, and Mg were also derived. We detected intrinsic K variations in the analyzed stars. Moreover, [K/Fe] shows a significant correlation with [Na/Fe] and an anticorrelation with [Mg/Fe]. The presence of a clear-cut Mg-K anticorrelation makes omega Centauri the third stellar system, after NGC 2419 and NGC 2808, hosting a subpopulation of stars with [Mg/Fe] < 0.0 dex, K-enriched in the case of omega Centauri by similar to 0.3 dex with respect to Mg-rich stars ([Mg/Fe] > 0.0 dex). The correlation/anticorrelation between K and other light elements involved in chemical anomalies supports the idea that the spread in [K/Fe] can be associated with the same self-enrichment process typical of globular clusters. We suggest that significant variations in K abundances perhaps can be found in the most massive and/or metal-poor globular clusters as a manifestation of an extreme self-enrichment process. Theoretical models face problems explaining K production in globular clusters. Indeed, models where asymptotic giant branch stars are responsible for the Mg-K anticorrelation only qualitatively agree with the observations. Finally, we discovered a peculiar star with an extraordinary K overabundance ([K/Fe] = +1.60 dex) with respect to the other stars with similar [Mg/Fe]. We suggest that this K-rich star could be formed from the pure ejecta of AGB stars before dilution with pristine material.

Keyword:

GLOBULAR-CLUSTERS

CHEMICAL EVOLUTION

ABUNDANCE PATTERNS

GIANT BRANCH

POPULATIONS

ELEMENTS

CODE

期刊

Astrophysical Journal Letters

IF:

11.7

论文数:

1.2W

被引数:

5.9W

机构

universite libre de bruxelles

学者数:

2.0W

论文数: 1.7W

被引数: 27

University of Bologna

学者数:

4.5W

论文数: 3.8W

被引数: 4.1W

istituto nazionale astrofisica (inaf)

学者数:

1.4W

论文数: 1.5W

被引数: 44

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