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Gaia Early Data Release 3: The Gaia Catalogue of Nearby Stars
INAF – Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese (TO), Italy.
Departmento de Inteligencia Artificial, UNED, c/ Juan del Rosal 16, 28040 Madrid, Spain.
Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany.
Institut UTINAM CNRS UMR6213, Université Bourgogne Franche-Comté, OSU THETA Franche-Comté Bourgogne, Observatoire de Besançon, BP1615, 25010 Besançon Cedex, France.
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2021 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 649, article id A6Article in journal (Refereed) Published
Abstract [en]

Aims. We produce a clean and well-characterised catalogue of objects within 100 pc of the Sun from the Gaia Early Data Release 3. We characterise the catalogue through comparisons to the full data release, external catalogues, and simulations. We carry out a first analysis of the science that is possible with this sample to demonstrate its potential and best practices for its use.

Methods. Theselection of objects within 100 pc from the full catalogue used selected training sets, machine-learning procedures, astrometric quantities, and solution quality indicators to determine a probability that the astrometric solution is reliable. The training set construction exploited the astrometric data, quality flags, and external photometry. For all candidates we calculated distance posterior probability densities using Bayesian procedures and mock catalogues to define priors. Any object with reliable astrometry and a non-zero probability of being within 100 pc is included in the catalogue.

Results. We have produced a catalogue of 331 312 objects that we estimate contains at least 92% of stars of stellar type M9 within 100 pc of the Sun. We estimate that 9% of the stars in this catalogue probably lie outside 100 pc, but when the distance probability function is used, a correct treatment of this contamination is possible. We produced luminosity functions with a high signal-to-noise ratio for the main-sequence stars, giants, and white dwarfs. We examined in detail the Hyades cluster, the white dwarf population, and wide-binary systems and produced candidate lists for all three samples. We detected local manifestations of several streams, superclusters, and halo objects, in which we identified 12 members of Gaia Enceladus. We present the first direct parallaxes of five objects in multiple systems within 10 pc of the Sun.

Conclusions. We provide the community with a large, well-characterised catalogue of objects in the solar neighbourhood. This is a primary benchmark for measuring and understanding fundamental parameters and descriptive functions in astronomy.

Place, publisher, year, edition, pages
EDP Sciences, 2021. Vol. 649, article id A6
Keywords [en]
catalogs, astrometry, stars: luminosity function, mass function, Hertzsprung-Russell and C-M diagrams, stars: low-mass, solar neighborhood
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Onboard Space Systems
Identifiers
URN: urn:nbn:se:ltu:diva-84304DOI: 10.1051/0004-6361/202039498ISI: 000645222500012Scopus ID: 2-s2.0-85104962488OAI: oai:DiVA.org:ltu-84304DiVA, id: diva2:1554757
Note

Validerad;2021;Nivå 2;2021-05-17 (alebob);

Finansiär: För finansiärsinformation se Acknowledgements https://www.aanda.org/articles/aa/full_html/2021/05/aa39498-20/aa39498-20.html#ack

Available from: 2021-05-17 Created: 2021-05-17 Last updated: 2024-03-05Bibliographically approved

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Granvik, Mikael

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