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http://hdl.handle.net/20.500.12386/27832
Title: | Observing multiple populations in globular clusters with the ESO archive: NGC 6388 reloaded | Authors: | CARRETTA, Eugenio BRAGAGLIA, Angela |
Issue Date: | 2018 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 614 | First Page: | A109 | Abstract: | The metal-rich and old bulge globular cluster (GC) NGC 6388 is one of the most massive Galactic GCs (M 10<SUP>6</SUP> M<SUB>☉</SUB>). However, the spectroscopic properties of its multiple stellar populations rested only on 32 red giants (only 7 of which observed with UVES, the others with GIRAFFE), given the difficulties in observing a rather distant cluster, heavily contaminated by bulge and disc field stars. We bypassed the problem using the resources of the largest telescope facility ever: the European Southern Observatory (ESO) archive. By selecting member stars identified by other programmes, we derive atmospheric parameters and the full set of abundances for 15 species from high-resolution UVES spectra of another 17 red giant branch stars in NGC 6388. We confirm that no metallicity dispersion is detectable in this GC. About 30% of the stars show the primordial composition of first-generation stars, about 20% present an extremely modified second-generation composition, and 50% have an intermediate composition. The stars are clearly distributed in the Al-O and Na-O planes in three discrete groups. We find substantial hints that more than a single class of polluters is required to reproduce the composition of the intermediate component in NGC 6388. In the heavily polluted component the sum Mg+Al increases as Al increases. The sum Mg+Al+Si is constant, and is the fossil record of hot H-burning at temperatures higher than about 70 MK in the first-generation polluters that contributed to form multiple populations in this cluster. <P />Based on observations collected at ESO telescopes under programmes 073.D-0211 (propr ietary), and 073.D-0760, 381.D-0329, 095.D-0834 (archival). | URI: | http://hdl.handle.net/20.500.12386/27832 | URL: | https://www.aanda.org/articles/aa/abs/2018/06/aa32660-18/aa32660-18.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201832660 | Bibcode ADS: | 2018A&A...614A.109C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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aa32660-18.pdf | PDF editoriale | 1.52 MB | Adobe PDF | View/Open |
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