Ground-based follow-up of the Gaia-RVS radial velocity standards

C. Soubiran (1) , Gérard Jasniewicz (2) , C. Zurbach (2) , F. Crifo (3) , P. Sartoretti (3) , D. Katz (3) , O. Marchal (4) , P. Panuzzo (5) , S. Udry (6)

1 M2A 2016
2 LUPM - Laboratoire Univers et Particules de Montpellier
3 GEPI - Galaxies, Etoiles, Physique, Instrumentation
4 PSPM - Probabilités, statistique, physique mathématique
5 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
6 UNIGE - Université de Genève = University of Geneva

The RVS spectrograph on board of Gaia having no calibration device, radial velocity standards are needed to calibrate the zero-point of the instrument. We have prepared a list of 2798 such stars, well distributed over the sky, and compiled ˜25 000 individual RV measurements from ground-based velocimeters. For a fraction of these stars, their stability at the 300 ms level during the Gaia mission has still to be assessed. The catalogue and follow-up programme are presented.

Mots clés: radial velocity; stars; Gaia

Domaines: Planète et Univers [physics]; Astrophysique [astro-ph]; Astrophysique stellaire et solaire [astro-ph.SR]; Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

C. Soubiran, Gérard Jasniewicz, C. Zurbach, F. Crifo, P. Sartoretti, et al.. Ground-based follow-up of the Gaia-RVS radial velocity standards. SF2A-2016: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: C. Reylé, J. Richard, L. Cambrésy, M. Deleuil, E. Pécontal, L. Tresse and I. Vauglin, held 14-17 June, 2016 at the Centre de Recherche Astrophysique de Lyon, pp.249-252, Jun 2016, Lyon, France. ⟨hal-02004037⟩