2008
DOI: 10.1086/592229
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Chemical Abundances in Giant Stars of the Tidally Disrupted Globular Cluster NGC 6712 from High‐Resolution Infrared Spectroscopy

Abstract: We present abundances of C, N, O, F, Na, and Fe in six giant stars of the tidally disrupted globular cluster NGC 6712. The abundances were derived by comparing synthetic spectra with high-resolution infrared spectra obtained with the Phoenix spectrograph on the Gemini South telescope. We find large star-to-star abundance variations of the elements C, N, O, F, and Na. NGC 6712 and M4 are the only globular clusters in which F has been measured in more than two stars, and both clusters reveal F abundance variatio… Show more

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Cited by 55 publications
(53 citation statements)
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“…In the case of the most metal-rich GCs such as 47 Tuc (Carretta et al 2005) and NGC 6712 (Yong et al 2008), this C+N+O constancy is actually compatible with pollution by both standard and rotating AGB stars since the 2DUP CNO enrichment is found to be negligible in the most metal-rich rotating models. This is of course without considering possible C+N+O increase due to the 3DUP of He-processed material during the TP-AGB phase, which is beyond the scope of the present study.…”
Section: Comparison With the Observationsmentioning
confidence: 69%
“…In the case of the most metal-rich GCs such as 47 Tuc (Carretta et al 2005) and NGC 6712 (Yong et al 2008), this C+N+O constancy is actually compatible with pollution by both standard and rotating AGB stars since the 2DUP CNO enrichment is found to be negligible in the most metal-rich rotating models. This is of course without considering possible C+N+O increase due to the 3DUP of He-processed material during the TP-AGB phase, which is beyond the scope of the present study.…”
Section: Comparison With the Observationsmentioning
confidence: 69%
“…But the question of how many field halo stars come from disrupted GCs is still under debate (e.g. Yong et al 2008;Boley et al 2009;Martell & Grebel 2010;Carretta et al 2010). Recently, Jordi & Grebel (2010) detected tidal features using the same data set as this study.…”
Section: Consequencesmentioning
confidence: 79%
“…For all three cases, R04 considered neutrino spallation to be largely dominant in fluorine production, and they adopted the SN II yields of Woosley & Weaver (1995), which assume a total energy in neutrinos of E ν = 3 × 10 53 erg. As for K11, five cases are included: evolution with neither AGBs nor ν-process (SN II/Ia + HN; triple-dot-dashed line), chemical evolution with AGB (2003) and ; diamonds, squares, crosses, and triangles for globular cluster giants from M4 , M22 (Alves-Brito et al 2012), NGC 6712 (Yong et al 2008), and ω Cen (Cunha et al 2003), respectively; pluses for bulge giants from Cunha et al (2008). Filled symbols are the same as in Figure 7, except that the CH-star HD 135148 is not included in the plot due to its peculiarly enhanced F abundances as explained in the context.…”
Section: Discussionmentioning
confidence: 99%