Fluorine variations in the globular cluster NGC 6656 (m22): Implications for internal enrichment timescales
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D’Orazi , V; Lucatello, Sara; Lugaro, Maria; Gratton, Raffaele G.; Angelou, G C; Bragaglia, Angela; Carretta, Eugenio; Alves-Brito, Alan; Ivans, Inese; Masseron, Thomas; Mucciarelli, Alessio
Description
Observed chemical (anti)correlations in proton-capture elements among globular cluster stars are presently recognized as the signature of self-enrichment from now extinct, previous generations of stars. This defines the multiple population scenario. Since fluorine is also affected by proton captures, determining its abundance in globular clusters provides new and complementary clues regarding the nature of these previous generations and supplies strong observational constraints to the chemical...[Show more]
dc.contributor.author | D’Orazi , V | |
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dc.contributor.author | Lucatello, Sara | |
dc.contributor.author | Lugaro, Maria | |
dc.contributor.author | Gratton, Raffaele G. | |
dc.contributor.author | Angelou, G C | |
dc.contributor.author | Bragaglia, Angela | |
dc.contributor.author | Carretta, Eugenio | |
dc.contributor.author | Alves-Brito, Alan | |
dc.contributor.author | Ivans, Inese | |
dc.contributor.author | Masseron, Thomas | |
dc.contributor.author | Mucciarelli, Alessio | |
dc.date.accessioned | 2015-12-13T22:28:30Z | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/74231 | |
dc.description.abstract | Observed chemical (anti)correlations in proton-capture elements among globular cluster stars are presently recognized as the signature of self-enrichment from now extinct, previous generations of stars. This defines the multiple population scenario. Since fluorine is also affected by proton captures, determining its abundance in globular clusters provides new and complementary clues regarding the nature of these previous generations and supplies strong observational constraints to the chemical enrichment timescales. In this paper, we present our results on near-infrared CRIRES spectroscopic observations of six cool giant stars in NGC 6656 (M22): the main objective is to derive the F content and its internal variation in this peculiar cluster, which exhibits significant changes in both light- and heavy-element abundances. Across our sample, we detected F variations beyond the measurement uncertainties and found that the F abundances are positively correlated with O and anticorrelated with Na, as expected according to the multiple population framework. Furthermore, our observations reveal an increase in the F content between the two different sub-groups, s-process rich and s-process poor, hosted within M22. The comparison with theoretical models suggests that asymptotic giant stars with masses between 4 and 5 M⊙ are responsible for the observed chemical pattern, confirming evidence from previous works: the difference in age between the two sub-components in M22 must be not larger than a few hundred Myr. | |
dc.publisher | IOP Publishing | |
dc.source | Astrophysical Journal, The | |
dc.subject | Keywords: globular clusters: individual (NGC 6656); stars: abundances; stars: AGB and post-AGB; stars: Population II | |
dc.title | Fluorine variations in the globular cluster NGC 6656 (m22): Implications for internal enrichment timescales | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 763 | |
dc.date.issued | 2013 | |
local.identifier.absfor | 020103 - Cosmology and Extragalactic Astronomy | |
local.identifier.ariespublication | f5625xPUB4023 | |
local.type.status | Published Version | |
local.contributor.affiliation | D’Orazi , V, Macquarie University | |
local.contributor.affiliation | Lucatello, Sara, INAF, Osservatorio Astronomico di Padova | |
local.contributor.affiliation | Lugaro, Maria, Monash University | |
local.contributor.affiliation | Gratton, Raffaele G., INAF-Osservatorio Astronomico di Padova | |
local.contributor.affiliation | Angelou, G C, Monash University | |
local.contributor.affiliation | Bragaglia, Angela, INAF Osservatorio Astronomico di Bologna | |
local.contributor.affiliation | Carretta, Eugenio, INAF Osservatorio Astronomico di Bologna | |
local.contributor.affiliation | Alves-Brito, Alan, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Ivans, Inese, University of Utah | |
local.contributor.affiliation | Masseron, Thomas, Universite Libre de Bruxelles (ULB) | |
local.contributor.affiliation | Mucciarelli, Alessio, Universita di Bologna | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 1 | |
local.bibliographicCitation.startpage | 9 | |
local.identifier.doi | 10.1088/0004-637X/763/1/22 | |
dc.date.updated | 2016-02-24T09:20:05Z | |
local.identifier.scopusID | 2-s2.0-84872249426 | |
Collections | ANU Research Publications |
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