A different view on light element anti-correlations in globular clusters: fluorine abundances in NGC 6656 (M22)

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

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

Abstract

Observed chemical (anti)correlations in the light elements C, N, O, Na, Mg, and Al among globular cluster (GC) stars are presently recognised as the signature of self-pollution from previous generations of stars. This defines the multiple population scenario (MPS). Since fluorine is involved in the complete CNO cycle, determining its abundance in GCs provides new and complementary clues regarding the nature of these previous generations. In fact, along with the Na-O and Mg-Al anti-correlations, the MPS also predicts an anti-correlation between F and Na and a positive correlation between F and O. Furthermore, theoretical models suggest that low-mass (≲5M⊙) asymptotic giant branch (AGB) stars are F producers (and are also responsible for C+N+O and s-process element variations). We present our results on near-infrared CRIRES spectroscopic observations of six giant stars in the metal-poor GC NGC 6656 (M22): we aim at inferring the F content and its (possible) variation in this GC, which exhibits a rather peculiar abundance pattern, with variations in both light (C, N, O, Na, Mg, Al) and heavy (Fe-peak and s-process) elements.
Original languageEnglish
Title of host publicationXII international symposium on Nuclei in the cosmos
Place of PublicationTrieste
PublisherSissa Medialab Srl
Pages1-5
Number of pages5
DOIs
Publication statusPublished - 2012
EventInternational Symposium on Nuclei in the Cosmos (12th : 2012) - Cairns, Qld.
Duration: 5 Aug 201212 Aug 2012

Publication series

NameProceedings of Science
Volume146

Conference

ConferenceInternational Symposium on Nuclei in the Cosmos (12th : 2012)
CityCairns, Qld.
Period5/08/1212/08/12

Fingerprint Dive into the research topics of 'A different view on light element anti-correlations in globular clusters: fluorine abundances in NGC 6656 (M22)'. Together they form a unique fingerprint.

Cite this