| DOI | Trouver le DOI : https://doi.org/10.1093/mnras/stw2865 |
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| Auteur | Rechercher : Lamb, M.1; Rechercher : Venn, K.1; Rechercher : Andersen, D.1; Rechercher : Oya, S.; Rechercher : Shetrone, M.; Rechercher : Fattahi, A.; Rechercher : Howes, L.; Rechercher : Asplund, M.; Rechercher : Lardière, O.1; Rechercher : Akiyama, M.; Rechercher : Ono, Y.; Rechercher : Terada, H.; Rechercher : Hayano, Y.; Rechercher : Suzuki, G.; Rechercher : Blain, C.1; Rechercher : Jackson, K.1; Rechercher : Correia, C.; Rechercher : Youakim, K.; Rechercher : Bradley, C. |
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| Affiliation | - Conseil national de recherches du Canada. Herzberg en astronomie et en astrophysique
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| Format | Texte, Article |
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| Sujet | instrumentation: adaptive optics; techniques: spectroscopic; stars: abundances; Galaxy: centre; globular clusters: individual: M22 |
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| Résumé | The chemical abundances for five metal-poor stars in and towards the Galactic bulge have been determined from the H-band infrared spectroscopy taken with the RAVEN multi-object adaptive optics science demonstrator and the Infrared Camera and Spectrograph at the Subaru 8.2-m telescope. Three of these stars are in the Galactic bulge and have metallicities between −2.1 < [Fe/H] < −1.5, and high [α/Fe] ∼ +0.3, typical of Galactic disc and bulge stars in this metallicity range; [Al/Fe] and [N/Fe] are also high, whereas [C/Fe] < +0.3. An examination of their orbits suggests that two of these stars may be confined to the Galactic bulge and one is a halo trespasser, though proper motion values used to calculate orbits are quite uncertain. An additional two stars in the globular cluster M22 show [Fe/H] values consistent to within 1σ, although one of these two stars has [Fe/H] = −2.01 ± 0.09, which is on the low end for this cluster. The [α/Fe] and [Ni/Fe] values differ by 2σ, with the most metal-poor star showing significantly higher values for these elements. M22 is known to show element abundance variations, consistent with a multipopulation scenario though our results cannot discriminate this clearly given our abundance uncertainties. This is the first science demonstration of multi-object adaptive optics with high-resolution infrared spectroscopy, and we also discuss the feasibility of this technique for use in the upcoming era of 30-m class telescope facilities. |
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| Date de publication | 2016-11-05 |
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| Maison d’édition | Oxford University Press |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 23003457 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 27f01d96-3060-4468-9e2b-746b18f139ca |
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| Enregistrement créé | 2018-06-28 |
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| Enregistrement modifié | 2020-03-16 |
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