Gaia Data Release 3: Analysis of the Gaia BP/RP spectra using the General Stellar Parameterizer from Photometry

Andrae, R., Fouesneau, M., Sordo, R., Bailer-Jones, C. A. L., Dharmawardena, T. E., Sarro Baro, Luis Manuel y et al. . (2023) Gaia Data Release 3: Analysis of the Gaia BP/RP spectra using the General Stellar Parameterizer from Photometry. Astronomy & Astrophysics (A&A), 674, A27 (2023)

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Título Gaia Data Release 3: Analysis of the Gaia BP/RP spectra using the General Stellar Parameterizer from Photometry
Autor(es) Andrae, R.
Fouesneau, M.
Sordo, R.
Bailer-Jones, C. A. L.
Dharmawardena, T. E.
Sarro Baro, Luis Manuel
et al.
Materia(s) Ingeniería Informática
Abstract Context. The astrophysical characterisation of sources is among the major new data products in the third Gaia Data Release (DR3). In particular, there are stellar parameters for 471 million sources estimated from low-resolution BP/RP spectra. Aims. We present the General Stellar Parameterizer from Photometry (GSP-Phot), which is part of the astrophysical parameters inference system (Apsis). GSP-Phot is designed to produce a homogeneous catalogue of parameters for hundreds of millions of single non-variable stars based on their astrometry, photometry, and low-resolution BP/RP spectra. These parameters are e ective temperature, surface gravity, metallicity, absolute MG magnitude, radius, distance, and extinction for each star. Methods. GSP-Phot uses a Bayesian forward-modelling approach to simultaneously fit the BP/RP spectrum, parallax, and apparent G magnitude. A major design feature of GSP-Phot is the use of the apparent flux levels of BP/RP spectra to derive, in combination with isochrone models, tight observational constraints on radii and distances.We carefully validate the uncertainty estimates by exploiting repeat Gaia observations of the same source. Results. The data release includes GSP-Phot results for 471 million sources with G < 19. Typical di erences to literature values are 110K for Te and 0.2–0.25 for log g, but these depend strongly on data quality. In particular, GSP-Phot results are significantly better for stars with good parallax measurements ($= $ > 20), mostly within 2 kpc. Metallicity estimates exhibit substantial biases compared to literature values and are only useful at a qualitative level. However, we provide an empirical calibration of our metallicity estimates that largely removes these biases. Extinctions A0 and ABP show typical di erences from reference values of 0.07–0.09 mag. MCMC samples of the parameters are also available for 95% of the sources. Conclusions. GSP-Phot provides a homogeneous catalogue of stellar parameters, distances, and extinctions that can be used for various purposes, such as sample selections (OB stars, red giants, solar analogues etc.). In the context of asteroseismology or ground-based interferometry, where targets are usually bright and have good parallax measurements, GSP-Phot results should be particularly useful for combined analysis or target selection.
Palabras clave stars: fundamental parameters
surveys
catalogs
methods: data analysis
Editor(es) EDP Sciences
Fecha 2023
Formato application/pdf
Identificador bibliuned:95-Lmsarro-0019
http://e-spacio.uned.es/fez/view/bibliuned:95-Lmsarro-0019
DOI - identifier https://doi.org/10.1051/0004-6361/202243462
ISSN - identifier 1432-0746
Nombre de la revista Astronomy & Astrophysics (A&A)
Número de Volumen 674
Número de Issue 27
Publicado en la Revista Astronomy & Astrophysics (A&A), 674, A27 (2023)
Idioma eng
Versión de la publicación acceptedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales La versión registrada de este artículo, publicado por primera vez en Astronomy & Astrophysics (2023) 674,27 está disponible en línea en el sitio web del editor: EDP Sciences; https://doi.org/10.1051/0004-6361/202243462
Notas adicionales The registered version of this paper, first published in Astronomy & Astrophysics (2023) 674, 27 is available online at the publisher's website: EDP Sciences; https://doi.org/10.1051/0004-6361/202243462

 
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