Using the multi-object adaptive optics demonstrator RAVEN to observe metal-poor stars in and towards the Galactic Centre

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

Lamb, M (Autor) Outra; Venn, K (Autor) Outra; Andersen, D (Autor) Outra; Oya, S (Autor) Outra; Shetrone, M (Autor) Outra; Fattahi, A (Autor) Outra; Howes, L (Autor) Outra; Asplund, M (Autor) Outra; Lardière, O (Autor) Outra; Akiyama, M (Autor) Outra; Ono, Y (Autor) Outra; Terada, H (Autor) Outra; Hayano, Y (Autor) Outra; Suzuki, G (Autor) Outra; Blain, C (Autor) Outra; Jackson, K (Autor) Outra; Correia, C (Autor) Outra; Youakim, K (Autor) Outra; Bradley, C (Autor) Outra

Revista

Título: Monthly Notices of the Royal Astronomical Society

Vol. 465

Páginas: 3536-3557

ISSN: 0035-8711

Editora: Oxford University Press

Indexação

ISI Web of Knowledge - 17 Citações

Scopus - 18 Citações

Outras Informações

ID Authenticus: P-014-ZCD

DOI: 10.1093/mnras/stw2865

Abstract (EN): 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 [¿/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 1¿, although one of these two stars has [Fe/H] = -2.01 ± 0.09, which is on the low end for this cluster. The [¿/Fe] and [Ni/Fe] values differ by 2¿, 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 22