Astrophysique Stellaire
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Hydrodynamical instabilities induced by atomic diffusion in A stars and their consequences

Auteur(s): Deal M., Richard O., Vauclair Sylvie

(Article) Publié: Astronomy & Astrophysics, vol. 589 p. (2016)

Géométrie et réalité, un questionnement sur la vérité

Auteur(s): Hausberger Thomas, Bächtold Manuel, François Thomas, Marie-Jeanne Patrice, Pinet Véronique, Guin Daniel, Guin Dominique, Reboul H., Christophe Pointier

(Autres publications) , 2016
Texte intégral en Openaccess :

Discovery of a complex linearly polarized spectrum of Betelgeuse dominated by depolarization of the continuum

Auteur(s): Aurière M. , López Ariste A. , Mathias P. , Lebre A., Josselin E., Montargès M. , Petit P. , Chiavassa A. , Paletou F. , Fabas N., Konstantinova-Antova R. , Donati J.-F. , Grunhut J. H. , Wade G. A. , Herpin Fabrice, Kervella P. , Perrin G. , Tessore B.

(Article) Publié: Astronomy & Astrophysics, vol. 591 p.A119 (2016)
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Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties

Auteur(s): Brown A., Prusti T., Bastian U., Biermann M., Evans W., Eyer L., Katz D., Lammers U., Siddiqui H., Soubiran C., Valette V., Aerts C., Holland D., Huc C., Cacciari C., Fabricius C., Guerra R., Hernández J., Panuzzo P., Thévenin F., Els S., Mercier E., Altmann M., Benson K., Berthier J., Blomme R., Carry B., Clementini G., Creevey O., Jasniewicz G.

(Article) Publié: Astronomy & Astrophysics, vol. 595 p.id.A2 (2016)
Texte intégral en Openaccess :

Ref Arxiv: 1609.04172
DOI: 10.1051/0004-6361/201629512
Ref. & Cit.: NASA ADS
830 citations
Résumé:

Context. At about 1000 days after the launch of Gaia we present the first Gaia data release, Gaia DR1, consisting of astrometry and photometry for over 1 billion sources brighter than magnitude 20.7. Aims: A summary of Gaia DR1 is presented along with illustrations of the scientific quality of the data, followed by a discussion of the limitations due to the preliminary nature of this release. Methods: The raw data collected by Gaia during the first 14 months of the mission have been processed by the Gaia Data Processing and Analysis Consortium (DPAC) and turned into an astrometric and photometric catalogue. Results: Gaia DR1 consists of three components: a primary astrometric data set which contains the positions, parallaxes, and mean proper motions for about 2 million of the brightest stars in common with the Hipparcos and Tycho-2 catalogues - a realisation of the Tycho-Gaia Astrometric Solution (TGAS) - and a secondary astrometric data set containing the positions for an additional 1.1 billion sources. The second component is the photometric data set, consisting of mean G-band magnitudes for all sources. The G-band light curves and the characteristics of 3000 Cepheid and RR Lyrae stars, observed at high cadence around the south ecliptic pole, form the third component. For the primary astrometric data set the typical uncertainty is about 0.3 mas for the positions and parallaxes, and about 1 mas yr-1 for the proper motions. A systematic component of 0.3 mas should be added to the parallax uncertainties. For the subset of 94 000 Hipparcos stars in the primary data set, the proper motions are much more precise at about 0.06 mas yr-1. For the secondary astrometric data set, the typical uncertainty of the positions is 10 mas. The median uncertainties on the mean G-band magnitudes range from the mmag level to0.03 mag over the magnitude range 5 to 20.7. Conclusions: Gaia DR1 is an important milestone ahead of the next Gaia data release, which will feature five-parameter astrometry for all sources. Extensive validation shows that Gaia DR1 represents a major advance in the mapping of the heavens and the availability of basic stellar data that underpin observational astrophysics. Nevertheless, the very preliminary nature of this first Gaia data release does lead to a number of important limitations to the data quality which should be carefully considered before drawing conclusions from the data.

A test field for Gaia. Radial velocity catalogue of stars in the South Ecliptic Pole

Auteur(s): Frémat Y. , Altmann M. , Pancino E. , Soubiran C., Jofré P. , Damerdji Y. , Heiter U. , Royer F. , Seabroke G. , Sordo R. , Blanco-Cuaresma S. , Jasniewicz G., Martayan C. , Thévenin F. , Vallenari A. , Blomme R. , David M. , Gosset E. , Katz D. , Viala Y. , Boudreault S. , Cantat-Gaudin T. , Lobel A. , Meisenheimer K. , Nordlander T. , Raskin G. , Royer P. , Zorec J.

(Article) Publié: Astronomy & Astrophysics, vol. 597 p.id.A10 (2017)
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Surface magnetism of cool stars

Auteur(s): Kochukhov O., Petit P., Strassmeier K. G., Carroll T. a., Fares R., Folsom C. P., Jeffers S. V., Korhonen H., Monnier J. D., Morin J., Rosen L., Roettenbacher R. m., Shulyak D.

Conférence invité: The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS19) (Uppsala, SE, 2016-06-06)
Actes de conférence: Astronomische Nachrichten, vol. 338 p.428-441 (2017)
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Studying stellar spin-down with Zeeman-Doppler magnetograms

Auteur(s): See V., Jardine M., Vidotto A. A., Donati J. -F., Saikia S. Boro, Fares R., Folsom C. P., Hebrard E. M., Jeffers S. V., Marsden S. C., Morin J., Petit P., Waite I. a., Collaboration Bcool

(Article) Publié: Monthly Notices Of The Royal Astronomical Society, vol. 466 p.1542-1554 (2017)
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Astrophysique Stellaire
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Astrophysique Stellaire
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