دورية أكاديمية
Using the multi-object adaptive optics demonstrator RAVEN to observe metal-poor stars in and towards the Galactic Centre
| العنوان: | Using the multi-object adaptive optics demonstrator RAVEN to observe metal-poor stars in and towards the Galactic Centre |
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| المؤلفون: | Lamb, M., Venn, K., Andersen, D., Oya, S., Shetrone, M., Fattahi, A., Howes, L., Asplund, M., Lardière, O., Akiyama, M., Ono, Y., Terada, H., Hayano, Y., Suzuki, G., Blain, C., Jackson, K., Correia, C., Youakim, K., Bradley, C. |
| المصدر: | Monthly Notices of the Royal Astronomical Society; 465(3), pp 3536-3557 (2017) ; ISSN: 0035-8711 |
| بيانات النشر: | Oxford University Press |
| سنة النشر: | 2017 |
| المجموعة: | Lund University Publications (LUP) |
| مصطلحات موضوعية: | Astronomy, Astrophysics and Cosmology, Galaxy: centre, Globular clusters: individual: M22, Instrumentation: adaptive optics, Stars: abundances, Techniques: spectroscopic |
| الوصف: | 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. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| ردمك: | 978-85-01-47055-3 85-01-47055-4 |
| العلاقة: | https://lup.lub.lu.se/record/0aa77ffc-82eb-4c0c-aee4-148894198cd5Test; http://dx.doi.org/10.1093/mnras/stw2865Test; scopus:85014705542 |
| DOI: | 10.1093/mnras/stw2865 |
| الإتاحة: | https://doi.org/10.1093/mnras/stw2865Test https://lup.lub.lu.se/record/0aa77ffc-82eb-4c0c-aee4-148894198cd5Test |
| رقم الانضمام: | edsbas.3A88581 |
| قاعدة البيانات: | BASE |
| ردمك: | 9788501470553 8501470554 |
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| DOI: | 10.1093/mnras/stw2865 |