Spectroscopic survey of the Galaxy with Gaia - II. The expected science yield from the Radial Velocity Spectrometer - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2005

Spectroscopic survey of the Galaxy with Gaia - II. The expected science yield from the Radial Velocity Spectrometer

M. I Wilkinson
  • Fonction : Auteur
A. Vallenari
  • Fonction : Auteur
U. Munari
  • Fonction : Auteur
D. Katz
Guillaume Bono
M. Cropper
  • Fonction : Auteur
S. Vidrih
  • Fonction : Auteur
T. Zwitter
  • Fonction : Auteur
G. Bertelli
  • Fonction : Auteur
F. Boschi
  • Fonction : Auteur
F. Castelli
  • Fonction : Auteur
M. David
  • Fonction : Auteur
A. Gómez
  • Fonction : Auteur
U. Jauregi
  • Fonction : Auteur
P. Marrese
T. Marsh
  • Fonction : Auteur
  • PersonId : 1030266
S. Pasetto
  • Fonction : Auteur
A. Prša
  • Fonction : Auteur
A. Siviero
  • Fonction : Auteur
R. Sordo
  • Fonction : Auteur
L. Tomasella
  • Fonction : Auteur

Résumé

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
Fichier principal
Vignette du fichier
Wilkinson et al. - 2005 - Spectroscopic survey of the Galaxy with Gaia- II. .pdf (2.79 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02054018 , version 1 (01-03-2019)

Identifiants

Citer

M. I Wilkinson, A. Vallenari, C. Turon, U. Munari, D. Katz, et al.. Spectroscopic survey of the Galaxy with Gaia - II. The expected science yield from the Radial Velocity Spectrometer. Monthly Notices of the Royal Astronomical Society, 2005, 359 (4), pp.1306-1335. ⟨10.1111/j.1365-2966.2005.09012.x⟩. ⟨hal-02054018⟩
51 Consultations
43 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More