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gaia data release 3 documentation

14.4 Comparison with external catalogues

14.4.6 Astrophysical parameters

All the astrophysical parameters expected to be identical for binary stars are tested using the wide binary catalogue of El-Badry et al. (2021) limited to a chance alignment probability R_chance_align<0.1.


First tests work on low extinction stars, checking that indeed their extinction values and associated uncertainties are consistent with being low. For this we use a selection in Galactic latitude b>50where the extinction is expected to be small and at most E(B-V)=0.05, stars within the local bubble with parallax>20 mas (50 pc), where there is no significant extinction, and stars for which A_0<0.05 according to the 3D extinction map of Lallement et al. (2019). We also use those low extinction samples to check the DIB equivalent width, the colour-temperature relations, the GSP-Phot absolute magnitude, the FLAME stellar evolutionary stage and the DSC classification.

We compare the Gaia DR3 extinctions to the ones provided together with APOGEE DR16 by STARHORSE (Queiroz et al. 2020) and with GALAH DR3 by BSTEP (Buder et al. 2021).

The 2D extinction map is compared to the Planck (Planck Collaboration et al. 2016) and Schlegel et al. (1998) maps.

Temperature, log g, metallicity, abundances

Temperatures, logg, metallicity and abundances were compared with spectroscopic surveys ones: APOGEE DR16 (Ahumada et al. 2020) and GALAH DR3 (Buder et al. 2021). For resolved binaries (MSC results), the parameters are compared to the GALAH ones of Traven et al. (2020a).

Stellar evolution parameters

logg, luminosity, radius, mass and ages were compared with asteroseismic ones (Yu et al. 2018; Serenelli et al. 2017; Godoy-Rivera et al. 2021). Radius are compared with the JMMC Catalogues: JSDC version 2 (Bourges et al. 2017) and JMDC (Duvert 2016), selecting only stars with Gaia DR3 parallax relative error smaller than 10%. The gravitational redshift is compared to GALAH DR3 (Buder et al. 2021) and Carmenes (Lafarga et al. 2020).