| DOI | Resolve DOI: https://doi.org/10.1093/mnras/stw2865 |
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| Author | Search for: Lamb, M.1; Search for: Venn, K.1; Search for: Andersen, D.1; Search for: Oya, S.; Search for: Shetrone, M.; Search for: Fattahi, A.; Search for: Howes, L.; Search for: Asplund, M.; Search for: Lardière, O.1; Search for: Akiyama, M.; Search for: Ono, Y.; Search for: Terada, H.; Search for: Hayano, Y.; Search for: Suzuki, G.; Search for: Blain, C.1; Search for: Jackson, K.1; Search for: Correia, C.; Search for: Youakim, K.; Search for: Bradley, C. |
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| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
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| Format | Text, Article |
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| Subject | instrumentation: adaptive optics; techniques: spectroscopic; stars: abundances; Galaxy: centre; globular clusters: individual: M22 |
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| Abstract | 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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| Publication date | 2016-11-05 |
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| Publisher | Oxford University Press |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 23003457 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 27f01d96-3060-4468-9e2b-746b18f139ca |
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| Record created | 2018-06-28 |
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| Record modified | 2020-03-16 |
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