Benchmarking Gaia DR3 Apsis with the Hyades and Pleiades open clusters
arXiv:2306.03132 · doi:10.1051/0004-6361/202346790
Abstract
The Gaia astrophysical parameters inference system (Apsis) provides astrophysical parameter estimates for several to 100s of millions of stars. We aim to benchmark Gaia DR3 Apsis. We have compiled about 1500 bona fide single stars in the Hyades and Pleiades open clusters for validation of PARSEC isochrones, and for comparison with Apsis estimates. PARSEC stellar isochrones in the Gaia photometric system enable us to assign average ages and metallicities to the clusters, and mass, effective temperature, luminosity, and surface gravity to the individual stars. Apsis does not recover the single-age, single-metallicity characteristic of the cluster populations. Ages assigned to cluster members seemingly follow the input template for Galactic populations, with earlier-type stars systematically being assigned younger ages than later-type stars. Cluster metallicities are underestimated by 0.1 to 0.2 dex. Effective temperature estimates are in general reliable. Surface gravity estimates reveal strong systematics for specific ranges of Gaia BP-RP colours. We caution that Gaia DR3 Apsis estimates can be subject to significant systematics. Some of the Apsis estimates, like metallicity, might only be meaningful for statistical studies of the time-averaged Galactic stellar population, but are not recommended to be used for individual stars.
Accepted for publication in A&A. Table 2 in its entirety can be requested from the authors in machine-readable format (mrt), and will become available via CDS. 8 pages, 6 figures. v2: Figure 6, right, updated based on Gaia DR3 Apsis GSP-Spec quality flags
References in corpus (19)
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- Improving PARSEC models for very low mass stars
- New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies
- Gaia Early Data Release 3: The Gaia Catalogue of Nearby Stars
- Gaia Data Release 3: Analysis of RVS spectra using the General Stellar Parametriser from spectroscopy
- Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G=18.5
- Gaia Data Release 3: Astrophysical parameters inference system (Apsis) I -- methods and content overview
- Gaia Data Release 3: Analysis of the Gaia BP/RP spectra using the General Stellar Parameterizer from Photometry
- Constraining the thermally pulsing asymptotic giant branch phase with resolved stellar populations in the Large Magellanic Cloud
- Gaia Data Release 3: Apsis II -- Stellar Parameters
- Bayesian Ages for Early-Type Stars from Isochrones Including Rotation, and a Possible Old Age for the Hyades
- Gaia DR3: Apsis III -- Non-stellar content and source classification
- The Seven Sisters DANCe. I. Empirical isochrones, Luminosity and Mass Functions of the Pleiades cluster
- A Gaia early DR3 mock stellar catalog: Galactic prior and selection function
- Lithium depletion boundary, stellar associations, and Gaia
- Ariel stellar characterisation: I -- homogeneous stellar parameters of 187 FGK planet host stars Description and validation of the method
- Astrophysical properties of 600 bonafide single stars in the Hyades open cluster
- Benchmarking MESA isochrones against the Hyades single star sequence
- Stellar age spreads in clusters as imprints of cluster-parent clump densities