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

Valentina D'Orazi; Maria Lugaro; George Angelou; Sara Lucatello; Raffaele G. Gratton; Angela Bragaglia; Eugenio Carretta; Alan Alves-Brito; Inese I Ivans; Thomas Masseron; Alessio Mucciarelli

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

Valentina D'Orazi, Maria Lugaro, George Angelou, Sara Lucatello, Raffaele G. Gratton, Angela Bragaglia, Eugenio Carretta, Alan Alves-Brito, Inese I Ivans, Thomas Masseron, Alessio Mucciarelli

Research output: Contribution to conference › Poster › peer-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_ȯ) 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 language	English
Number of pages	6
Publication status	Published - 2012
Event	International Symposium on Nuclei in the Cosmos 2012 - Cairns, Australia Duration: 5 Aug 2012 → 12 Aug 2012 Conference number: 12th

Conference

Conference	International Symposium on Nuclei in the Cosmos 2012
Abbreviated title	NIC XII
Country/Territory	Australia
City	Cairns
Period	5/08/12 → 12/08/12
Other	XII International Symposium on Nuclei in the Cosmos

Cite this

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). Poster session presented at International Symposium on Nuclei in the Cosmos 2012, Cairns, Queensland, Australia.

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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",

note = "International Symposium on Nuclei in the Cosmos 2012, NIC XII ; Conference date: 05-08-2012 Through 12-08-2012",

}

TY - CONF

T1 - A different view on light element anti-correlations in globular clusters

T2 - International Symposium on Nuclei in the Cosmos 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

N1 - Conference code: 12th

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 - Poster

AN - SCOPUS:84887484745

Y2 - 5 August 2012 through 12 August 2012

ER -

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

Abstract

Conference

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