Manioc : Portail | resultats 21 - 40 pour la recherche: H. Valentin

Bulletin officiel de la Guyane française
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Bulletin officiel de la Guyane française
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L'Église et l'esclavage
Auteur(s) : Rivière, Armand (1822-1891)
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Bulletin officiel de la Guyane française
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Bulletin officiel de la Guyane française
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Guide médical des Antilles, ou études sur les maladies des colonies en général, et sur celles qui sont propres à la race noire
Auteur(s) : Levacher, Michel-Gabriel (1802-18..)
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PLATO as it is: a legacy mission for Galactic archaeology
Auteur(s) : Miglio, A. Chiappini, C. Mosser, B. Davies, G. R. Freeman, K. Girardi, L. Jofre, P. Kawata, D.
Auteurs secondaires : Institut d'Astrophysique et de Géophysique [Liège] ; Université de Liège Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire de Paris - Université Paris Diderot - Paris 7 (UPD7) - Centre National de la Recherche Scientifique (CNRS) Arizona State University [Tempe] (ASU) Leibniz-Institut für Astrophysik Potsdam (AIP) Department of Physics and Astronomy [Aarhus] ; Aarhus University [Aarhus] School of Physics and Astronomy [Birmingham] ; University of Birmingham [Birmingham] Heckscher-Klinikum ; Heckscher-Klinikum Danish AsteroSeismology Centre (DASC) ; Aarhus University [Aarhus]

Éditeur(s) : HAL CCSD Wiley-VCH Verlag
Résumé : International audience
Deciphering the assembly history of the Milky Way is a formidable task, which becomes possible only if one can produce high-resolution chrono-chemo-kinematical maps of the Galaxy. Data from large-scale astrometric and spectroscopic surveys will soon provide us with a well-defined view of the current chemo-kinematical structure of the Milky Way, but will only enable a blurred view on the temporal sequence that led to the present-day Galaxy. As demonstrated by the (ongoing) exploitation of data from the pioneering photometric missions CoRoT, Kepler, and K2, asteroseismology provides the way forward: solar-like oscillating giants are excellent evolutionary clocks thanks to the availability of seismic constraints on their mass and to the tight age-initial-mass relation they adhere to. In this paper we identify five key outstanding questions relating to the formation and evolution of the Milky Way that will need precise and accurate ages for large samples of stars to be addressed, and we identify the requirements in terms of number of targets and the precision on the stellar properties that are needed to tackle such questions. By quantifying the asteroseismic yields expected from PLATO for red-giant stars, we demonstrate that these requirements are within the capabilities of the current instrument design, provided that observations are sufficiently long to identify the evolutionary state and allow robust and precise determination of acoustic-mode frequencies. This will allow us to harvest data of sufficient quality to reach a 10% precision in age. This is a fundamental pre-requisite to then reach the more ambitious goal of a similar level of accuracy, which will only be possible if we have to hand a careful appraisal of systematic uncertainties on age deriving from our limited understanding of stellar physics, a goal which conveniently falls within the main aims of PLATO's core science.
ISSN: 0004-6337

hal-01541393
https://hal.archives-ouvertes.fr/hal-01541393
ARXIV : 1706.3778
BIBCODE : 2017AN....338..644M
DOI : 10.1002/asna.201713385

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