Title :

Kinematic versus Spectroscopic Radial Velocities for the Gaia RVS

Author(s) :

Jasniewicz, Gérard [Auteur]
Groupe de Recherche en Astronomie et Astrophysique du Languedoc [GRAAL]
Thévenin, F. [Auteur]
Chiavassa, A. [Auteur]
Bigot, Lionel [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Chemin, L. [Auteur]
Crifo, F. [Auteur]
Galaxies, Etoiles, Physique, Instrumentation [GEPI]
Hestroffer, D. [Auteur]
Institut de Mécanique Céleste et de Calcul des Ephémérides [IMCCE]
Katz, D. [Auteur]
Observatoire de Paris - Site de Paris [OP]
Galaxies, Etoiles, Physique, Instrumentation [GEPI]
Sartoretti, P. [Auteur]
Soubiran, C. [Auteur]
Udry, S. [Auteur]
Observatoire Astronomique de l'Université de Genève [ObsGE]
Zurbach, C. [Auteur]
Laboratoire Univers et Particules de Montpellier [LUPM]

Conference title :

Proceedings SF2A 2013 - Scientific highlights

City :

Montpellier

Country :

France

Start date of the conference :

2013

Book title :

SF2A-2013: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics.- 4 au 7 juin 2013 à Montpellier,France Eds.: L. Cambresy, F. Martins, E. Nuss, A. Palacios - pp.137-140

Journal title :

SF2A-2013: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics.

Publication date :

2013-11

HAL domain(s) :

Planète et Univers [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
Physique [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

English abstract : [en]

The Gaia spectrometer (RVS) has no built-in calibration device and the RVS will rely on its own observations to carry out the wavelength calibration. A small sample (˜1420) of bright RVS F-G-K standard stars will be used ...
Show more >The Gaia spectrometer (RVS) has no built-in calibration device and the RVS will rely on its own observations to carry out the wavelength calibration. A small sample (˜1420) of bright RVS F-G-K standard stars will be used for the Radial Velocity Zero Point (RVZP) of the RVS. These standard stars have been observed on the ground with the Sophie, Coralie and Narval spectrometers, and their Spectroscopic Radial Velocities (SRVs) have been published by Soubiran et al. (2013). These SRVs are not Kinematic Radial Velocities (KRVs) which are what we need for studies of galatic dynamics. However in this paper we show that these SRVs are well suited to establish the Radial Velocity Zero Point of the Gaia RVS, provided that CU6 pipelines of the DPAC such as Calibration of the RVS (DU630) and Determination of RVs by cross-correlation with templates (DU650 STA) really use wavelength lines and spectra computed with 3D hydrodynamical model atmospheres, which conveniently treat the convective shifts. Final SRVs given by the Gaia CU6 pipelines and later published in the Gaia final catalogue would then only be corrected from the gravitational shift by the DPAC CU8 in order to become true KRVs.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL