Blomme, R;
Fremat, Y;
Sartoretti, P;
Guerrier, A;
Panuzzo, P;
Katz, D;
Seabroke, GM;
... Zorec, J; + view all
(2022)
Gaia Data Release 3: Hot-star radial velocities.
Astronomy & Astrophysics
10.1051/0004-6361/202243685.
(In press).
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Abstract
CONTEXT: The second Gaia data release, DR2, contained radial velocities of stars with effective temperatures up to T_{eff} = 6900 K. The third data release, Gaia DR3, extends this up to T_{eff} = 14 500 K. AIMS: We derive the radial velocities for hot stars (i.e. in the T_{eff} = 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.
| Type: | Article |
|---|---|
| Title: | Gaia Data Release 3: Hot-star radial velocities |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202243685 |
| Publisher version: | https://doi.org/10.1051/0004-6361/202243685 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Techniques: spectroscopic, Techniques: radial velocitiesm, Methods: data analysis, Catalogs, Surveys, Stars: massive |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10150690 |
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