Gaia Data Release 3 Hot-star radial velocities

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Gaia Data Release 3 Hot-star radial velocities

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Gaia Data Release 3 Hot-star radial velocities

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Astronomy &amp; Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

674

Číslo periodika v rámci svazku

červen

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

12

Strana od-do

A7

Kód UT WoS článku

001024440700007

EID výsledku v databázi Scopus

2-s2.0-85163663838