Aluminum abundances of multiple stellar generations in the globular cluster NGC 1851

E. Carretta*, V. D'Orazi, R. G. Gratton, S. Lucatello

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)

    Abstract

    We studied the distribution of aluminum abundances among red giants in the peculiar globular cluster NGC 1851. Aluminum abundances were derived from the strong doublet Al i 8772-8773 Ãmeasured on intermediate-resolution FLAMES spectra of 50 cluster stars acquired under the Gaia-ESO public survey. We coupled these abundances with previously derived abundances of O, Na, and Mg to fully characterize the interplay of the NeNa and MgAl cycles of H-burning at high temperature in the early stellar generation in NGC 1851. The stars in our sample show well-defined correlations between Al, Na and Si; Al is anticorrelated with O and Mg. The average value of the [Al/Fe] ratio steadily increases from the first generation stars to the second generation populations with intermediate and extremely modified composition. We confirm on a larger database the results recently obtained by us: the pattern of abundances of proton-capture elements implies a moderate production of Al in NGC 1851. We find evidence of a statistically significant positive correlation between Al and Ba abundances in the more metal-rich component of red giants in NGC 1851.

    Original languageEnglish
    Article numberA117
    Pages (from-to)1-6
    Number of pages6
    JournalAstronomy and Astrophysics
    Volume543
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    Dive into the research topics of 'Aluminum abundances of multiple stellar generations in the globular cluster NGC 1851'. Together they form a unique fingerprint.

    Cite this