O and Na abundance patterns in open clusters of the Galactic disk - Astrophysics > Astrophysics of GalaxiesReport as inadecuate




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Abstract: Aims. A global O-Na abundance anti-correlation is observed in globularclusters, which is not present in the Galactic field population. Open clustersare thought to be chemically homogeneous internally. We aim to explore the Oand Na abundance pattern among the open cluster population of the Galacticdisk.Methods. We combine open cluster abundance ratios of O and Na fromhigh-resolution spectroscopic studies in the literature and normalize them to acommon solar scale. We compare the open cluster abundances against the globularclusters and disk field.Results. We find that the different environments show different abundancepatterns. The open clusters do not show the O-Na anti-correlation at theextreme O-depletion - Na-enhancement as observed in globular clusters.Furthermore, the high Na abundances in open clusters do not match the diskfield stars. If real, it may be suggesting that the dissolution of present-dayopen clusters is not a significant contribution to building the Galactic disk.Large-scale homogeneous studies of clusters and field will further confirm thereality of the Na enhancement.



Author: G.M. De Silva, B.K. Gibson, J. Lattanzio, M. Asplund

Source: https://arxiv.org/







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