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 (≲5Mȯ) 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.
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D'Orazi, V., Lugaro, M., Angelou, G., Lucatello, S., Gratton, R. G., Bragaglia, A., Carretta, E., Alves-Brito, A., Ivans, I. I., Masseron, T., & Mucciarelli, A. (2012). A different view on light element anti-correlations in globular clusters: Fluorine abundances in NGC 6656 (M22). Proceedings of Science.
D'Orazi, Valentina ; Lugaro, Maria ; Angelou, George et al. / A different view on light element anti-correlations in globular clusters : Fluorine abundances in NGC 6656 (M22). In: Proceedings of Science. 2012.
@article{af8fd3d3e9994fa9941526d6d8318b58,
title = "A different view on light element anti-correlations in globular clusters: Fluorine abundances in NGC 6656 (M22)",
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 (≲5Mȯ) 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.",
author = "Valentina D'Orazi and Maria Lugaro and George Angelou and Sara Lucatello and Gratton, {Raffaele G.} and Angela Bragaglia and Eugenio Carretta and Alan Alves-Brito and Ivans, {Inese I.} and Thomas Masseron and Alessio Mucciarelli",
year = "2012",
language = "English",
journal = "Proceedings of Science",
issn = "1824-8039",
publisher = "Sissa Medialab Srl",
note = "12th International Symposium on Nuclei in the Cosmos, NIC 2012 ; Conference date: 05-08-2012 Through 12-08-2012",
}
D'Orazi, V, Lugaro, M, Angelou, G, Lucatello, S, Gratton, RG, Bragaglia, A, Carretta, E, Alves-Brito, A, Ivans, II, Masseron, T & Mucciarelli, A 2012, 'A different view on light element anti-correlations in globular clusters: Fluorine abundances in NGC 6656 (M22)', Proceedings of Science.
A different view on light element anti-correlations in globular clusters: Fluorine abundances in NGC 6656 (M22). / D'Orazi, Valentina; Lugaro, Maria; Angelou, George et al.
In: Proceedings of Science, 2012.
Research output: Contribution to journal › Conference article › peer-review
TY - JOUR
T1 - A different view on light element anti-correlations in globular clusters
T2 - 12th International Symposium on Nuclei in the Cosmos, NIC 2012
AU - D'Orazi, Valentina
AU - Lugaro, Maria
AU - Angelou, George
AU - Lucatello, Sara
AU - Gratton, Raffaele G.
AU - Bragaglia, Angela
AU - Carretta, Eugenio
AU - Alves-Brito, Alan
AU - Ivans, Inese I.
AU - Masseron, Thomas
AU - Mucciarelli, Alessio
PY - 2012
Y1 - 2012
N2 - 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 (≲5Mȯ) 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.
AB - 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 (≲5Mȯ) 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.
UR - http://www.scopus.com/inward/record.url?scp=84887484745&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:84887484745
SN - 1824-8039
JO - Proceedings of Science
JF - Proceedings of Science
Y2 - 5 August 2012 through 12 August 2012
ER -
D'Orazi V, Lugaro M, Angelou G, Lucatello S, Gratton RG, Bragaglia A et al. A different view on light element anti-correlations in globular clusters: Fluorine abundances in NGC 6656 (M22). Proceedings of Science. 2012.
