A different view on light-element anticorrelations in globular clusters

fluorine abundances

V. D'Orazi, S. Lucatello, M. Lugaro, R. Gratton, G. Angelou, A. Bragaglia, E. Carretta, A. Alves-Brito, I. Ivans, T. Masseron, A. Mucciarelli

Research output: Contribution to journalArticle

Abstract

The light-element variations among globular cluster (GC) stars are nowadays accepted as the signature of self-enrichment from previous generations of stars. It is expected that these extinct progenitors experienced hot H-burning and, as fluorine is involved in the complete CNO cycle, the F abundance in GCs can provide new clues about the previous generation(s). Along with Na-O and Mg-Al anti-correlations, theory predicts an anti-correlation between F and Na and a positive correlation between F and O. Moreover, relatively low-mass AGB stars are F producers (and are also responsible for C+N+O and s-process element variations). We present our results on F abundances in four GCs (NGC 6656, NGC 6752, 47 Tucanae and omega Centauri), which exhibit notably different s-process and/or C+N+O abundance patterns.
Original languageEnglish
Pages (from-to)34-37
Number of pages4
JournalMemorie della Societa Astronomica Italiana - Journal of the Italian Astronomical Society
Volume84
Issue number1
Publication statusPublished - 2013

Keywords

  • stars: abundances
  • stars: Population II
  • galaxy: globular clusters
  • stars: AGB and post-AGB

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    D'Orazi, V., Lucatello, S., Lugaro, M., Gratton, R., Angelou, G., Bragaglia, A., ... Mucciarelli, A. (2013). A different view on light-element anticorrelations in globular clusters: fluorine abundances. Memorie della Societa Astronomica Italiana - Journal of the Italian Astronomical Society, 84(1), 34-37.