Gaia Data Release 3 Hot-star radial velocities

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10476084" target="_blank" >RIV/00216208:11320/23:10476084 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=LQ1kew-5hF" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=LQ1kew-5hF</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202243685" target="_blank" >10.1051/0004-6361/202243685</a>

Result language

angličtina

Original language name

Gaia Data Release 3 Hot-star radial velocities

Original language description

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 500K 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 similar to 12 mag.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy &amp; Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

674

Issue of the periodical within the volume

červen

Country of publishing house

FR - FRANCE

Number of pages

12

Pages from-to

A7

UT code for WoS article

001024440700007

EID of the result in the Scopus database

2-s2.0-85163663838