1. Spectroscopic survey of the Galaxy with Gaia - II. The expected science yield from the Radial Velocity Spectrometer
- Author
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M. I. Wilkinson, A. Vallenari, C. Turon, U. Munari, D. Katz, G. Bono, M. Cropper, A. Helmi, N. Robichon, F. Thévenin, S. Vidrih, T. Zwitter, F. Arenou, M.-O. Baylac, G. Bertelli, A. Bijaoui, F. Boschi, F. Castelli, F. Crifo, M. David, A. Gomboc, A. Gómez, M. Haywood, U. Jauregi, P. de Laverny, Y. Lebreton, P. Marrese, T. Marsh, S. Mignot, D. Morin, S. Pasetto, M. Perryman, A. Prša, A. Recio-Blanco, F. Royer, A. Sellier, A. Siviero, R. Sordo, C. Soubiran, L. Tomasella, Y. Viala, 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 Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-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 (... - 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, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE 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), Galilée (Galilée), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, and Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
GRAVITATIONAL LENSING EXPERIMENT ,Astrophysics ,01 natural sciences ,stars : general ,Astrophysics::Solar and Stellar Astrophysics ,010303 astronomy & astrophysics ,Stellar evolution ,stars: general ,Galaxy: structure ,Physics ,[PHYS]Physics [physics] ,Settore FIS/05 ,Astrophysics (astro-ph) ,Astrophysics::Instrumentation and Methods for Astrophysics ,Radial velocity ,AGE-METALLICITY RELATION ,Galaxy: formation ,PERIOD-LUMINOSITY RELATION ,Astrophysics::Earth and Planetary Astrophysics ,[SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA] ,Galaxy: kinematics and dynamics ,binaries: spectroscopic ,Galaxy : kinematics and dynamics ,Photometric system ,FOS: Physical sciences ,Galaxy : structure ,MILKY-WAY DISK ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Galaxy : evolution ,binaries : spectroscopic ,0103 physical sciences ,Spectrograph ,Astrophysics::Galaxy Astrophysics ,Galaxy: evolution ,SOLAR-TYPE STARS ,Spectrometer ,010308 nuclear & particles physics ,[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] ,SURVEY COMMISSIONING DATA ,Galaxy : formation ,Astronomy and Astrophysics ,HUBBLE-SPACE-TELESCOPE ,Galaxy ,Stars ,Space and Planetary Science ,DARK-MATTER HALOES ,DIGITAL SKY SURVEY ,LARGE-MAGELLANIC-CLOUD ,Variable star ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
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 (Katz et al. 2004) presents the characteristics of the RVS and its performance. This 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 which 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 to the identification, classification and characterisation of the many types of double, multiple and variable stars., 33 pages, 11 figures, in press at MNRAS. Figs 1, 3 and 9 included at reduced resolution; available in full resolution at http://www.blackwell-synergy.com/doi/pdf/10.1111/j.1365-2966.2005.09012.x
- Published
- 2005
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