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Using the multi-obj...
Using the multi-object adaptive optics demonstrator RAVEN to observe metal-poor stars in and towards the Galactic Centre
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- Lamb, M. (author)
- University of Victoria,National Research Council of Canada
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- Venn, K. (author)
- University of Victoria
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- Andersen, D. (author)
- National Research Council of Canada
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- Oya, S. (author)
- National Astronomical Observatory of Japan
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- Shetrone, M. (author)
- University of Texas at Austin
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- Fattahi, A. (author)
- University of Victoria
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- Howes, L. (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,Australian National University
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- Asplund, M. (author)
- Australian National University
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- Lardière, O. (author)
- National Research Council of Canada
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- Akiyama, M. (author)
- Tohoku University
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- Ono, Y. (author)
- Tohoku University
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- Terada, H. (author)
- National Astronomical Observatory of Japan
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- Hayano, Y. (author)
- National Astronomical Observatory of Japan
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- Suzuki, G. (author)
- Tohoku University
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- Blain, C. (author)
- University of Victoria
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- Jackson, K. (author)
- California Institute of Technology
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- Correia, C. (author)
- Laboratoire d'Astrophysique de Marseille (LAM)
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- Youakim, K. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Bradley, C. (author)
- University of Victoria
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(creator_code:org_t)
- 2016-11-05
- 2017
- English 22 s.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 465:3, s. 3536-3557
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Abstract
Subject headings
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- 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 multiobject 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Galaxy: centre
- Globular clusters: individual: M22
- Instrumentation: adaptive optics
- Stars: abundances
- Techniques: spectroscopic
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Lamb, M.
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Venn, K.
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Andersen, D.
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Oya, S.
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Shetrone, M.
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Fattahi, A.
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Howes, L.
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Asplund, M.
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Lardière, O.
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Akiyama, M.
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Ono, Y.
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Terada, H.
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Hayano, Y.
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Suzuki, G.
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Blain, C.
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Jackson, K.
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Correia, C.
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Youakim, K.
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Bradley, C.
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