Gaia Data Release 3. Hot-star radial velocities
- Creators
- Blomme, R.
- Frémat, Y.
- Sartoretti, P.
- Guerrier, A.
- Panuzzo, P.
- Katz, D.
- Seabroke, G. M.
- Thévenin, F.
- Cropper, M.
- Benson, K.
- Damerdji, Y.
- Haigron, R.
- Marchal, O.
- Smith, M.
- Baker, S.
- Chemin, L.
- David, M.
- Dolding, C.
- Gosset, E.
- Janßen, K.
- Jasniewicz, G.
- Lobel, A.
- Plum, G.
- Samaras, N.
- Snaith, O.
- Soubiran, C.
- Vanel, O.
- Zwitter, T.
- Brouillet, N.
- Caffau, E.
- Crifo, F.
- Fabre, C.
- Fragkoudi, F.
- Huckle, H. E.
- Jean-Antoine Piccolo, A.
- Lasne, Y.
- Leclerc, N.
- Mastrobuono-Battisti, A.
- Royer, F.
- Viala, Y.
- Zorec, J.
- 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)-Centre National de la Recherche Scientifique (CNRS)
- Centre National d'Études Spatiales [Toulouse] (CNES)
- Observatoire de la Côte d'Azur (OCA) ; Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Observatoire astronomique de Strasbourg (ObAS) ; Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Laboratoire Univers et Particules de Montpellier (LUPM) ; Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Institut d'Astrophysique de Paris (IAP) ; Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Description
Context. The second Gaia data release, DR2, contained radial velocities of stars with effective temperatures up to Teff = 6900 K. The third data release, Gaia DR3, extends this up to Teff = 14 500 K.
Aims: We derive the radial velocities for hot stars (i.e., in the Teff = 6900 − 14 500 K range) from data obtained with the Radial Velocity Spectrometer (RVS) on board Gaia.
Methods: The radial velocities were determined by the standard technique of measuring the Doppler shift of a template spectrum that was compared to the observed spectrum. The RVS wavelength range is very limited. The proximity to and systematic blueward offset of the calcium infrared triplet to the hydrogen Paschen lines in hot stars can result in a systematic offset in radial velocity. For the hot stars, we developed a specific code to improve the selection of the template spectrum, thereby avoiding this systematic offset.
Results: With the improved code, and with the correction we propose to the DR3 archive radial velocities, we obtain values that agree with reference values to within 3 km s−1 (in median). Because of the required S/N for applying the improved code, the hot star radial velocities in DR3 are mostly limited to stars with a magnitude in the RVS wavelength band ≤12 mag.
Abstract
International audience
Additional details
- URL
- https://hal-insu.archives-ouvertes.fr/insu-04146782
- URN
- urn:oai:HAL:insu-04146782v1
- Origin repository
- UNICA