Published 2005
| Version v1
Journal article
Spectroscopic survey of the Galaxy with Gaia - II. The expected science yield from the Radial Velocity Spectrometer
Creators
- Wilkinson, M.
- Vallenari, A.
- Turon, C.
- Munari, U.
- Katz, D.
- Bono, Guillaume
- Cropper, M.
- Helmi, A.
- Robichon, N.
- Thévenin, F.
- Vidrih, S.
- Zwitter, T.
- Arenou, Frédéric
- Baylac, M-O
- Bertelli, G.
- Bijaoui, A.
- Boschi, F.
- Castelli, F.
- Crifo, F.
- David, M.
- Gomboc, A.
- Gómez, A.
- Haywood, M.
- Jauregi, U.
- de Laverny, P.
- Lebreton, Y.
- Marrese, P.
- Marsh, T.
- Mignot, S.
- Morin, D.
- Pasetto, S.
- Perryman, M.
- Prša, A.
- Recio-Blanco, A.
- Royer, F.
- Sellier, Alain
- Siviero, A.
- Sordo, R.
- Soubiran, C.
- Tomasella, L.
- Viala, Y.
Contributors
Others:
- Galaxies, Etoiles, Physique, Instrumentation (GEPI) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
- Departament Llenguatges i Sistemes Informatics, ; Universitat Politècnica de Catalunya [Barcelona] (UPC)
- Joseph Louis LAGRANGE (LAGRANGE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Faculty of Mathematics and Physics [Ljubljana] (FMF) ; University of Ljubljana
- Griffith University [Brisbane]
- European Space Research and Technology Centre (ESTEC) ; European Space Agency (ESA)
- Observatoire aquitain des sciences de l'univers (OASU) ; Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Description
The Gaia mission is designed as a Galaxy explorer, and will measure simultaneously, in a survey mode, the five or six phase-space parameters of all stars brighter than 20th magnitude, as well as providing a description of their astrophysical characteristics. These measurements are obtained by combining an astrometric instrument with micro-arcsecond capabilities, a photometric system giving the magnitudes and colours in 15 bands and a medium-resolution spectrograph named the Radial Velocity Spectrometer (RVS). The latter instrument will produce spectra in the 848-to 874-nm wavelength range, with a resolving power R = 11 500, from which radial velocities, rotational velocities, atmospheric parameters and abundances can be derived. A companion paper has presented the characteristics of the RVS and its performance. The present paper details the outstanding scientific impact of this important part of the Gaia satellite on some key open questions in present-day astrophysics. The unbiased and simultaneous acquisition of multi-epoch radial velocities and individual abundances of key elements in parallel with the astrometric parameters is essential for the determination of the dynamical state and formation history of our Galaxy. Moreover, for stars brighter than V 15, the resolving power of the RVS will give information about most of the effects that influence the position of a star in the Hertzsprung-Russell diagram, placing unprecedented constraints on the age, internal structure and evolution of stars of all types. Finally, the RVS multi-epoch observations are ideally suited
Abstract
International audienceAdditional details
Identifiers
- URL
- https://hal.archives-ouvertes.fr/hal-02054018
- URN
- urn:oai:HAL:hal-02054018v1
Origin repository
- Origin repository
- UNICA