The gaia -ESO survey: Calibration strategy

Galaxy: general; Stars: abundances; Surveys; Techniques: radial velocities; Techniques: spectroscopic; Calibration; Galaxies; Stars; Surveying; Uncertainty analysis; Atmospheric parameters; Spectroscopic surveys; State-of-the-art methods; Systematic uncertainties

Abstract :

[en] The Gaia-ESO survey (GES) is now in its fifth and last year of observations and has produced tens of thousands of high-quality spectra of stars in all Milky Way components. This paper presents the strategy behind the selection of astrophysical calibration targets, ensuring that all GES results on radial velocities, atmospheric parameters, and chemical abundance ratios will be both internally consistent and easily comparable with other literature results, especially from other large spectroscopic surveys and from Gaia. The calibration of GES is particularly delicate because of (i) the large space of parameters covered by its targets, ranging from dwarfs to giants, from O to M stars; these targets have a large wide of metallicities and also include fast rotators, emission line objects, and stars affected by veiling; (ii) the variety of observing setups, with different wavelength ranges and resolution; and (iii) the choice of analyzing the data with many different state-of-the-art methods, each stronger in a different region of the parameter space, which ensures a better understanding of systematic uncertainties. An overview of the GES calibration and homogenization strategy is also given, along with some examples of the usage and results of calibrators in GES iDR4, which is the fourth internal GES data release and will form the basis of the next GES public data release. The agreement between GES iDR4 recommended values and reference values for the calibrating objects are very satisfactory. The average offsets and spreads are generally compatible with the GES measurement errors, which in iDR4 data already meet the requirements set by the main GES scientific goals. © ESO, 2017.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Pancino, E.; INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, Firenze, Italy, ASI Science Data Center, via del Politecnico s/n, Rome, Italy

Lardo, C.; Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool, United Kingdom

Altavilla, G.; INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, Bologna, Italy

Marinoni, S.; ASI Science Data Center, via del Politecnico s/n, Rome, Italy, INAF-Osservatorio Astronomico di Roma, via Frascati 33, Monte Porzio Catone, Roma, Italy

Ragaini, S.; INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, Bologna, Italy

Cocozza, G.; INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, Bologna, Italy

Bellazzini, M.; INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, Bologna, Italy

Sabbi, E.; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, United States

Zoccali, M.; Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile, Millennium Institute of Astrophysics, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile

Donati, P.; INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, Bologna, Italy, Dipartimento di Fisica e Astronomia, Alma Mater Studiorum, Università di Bologna, Viale Berti Pichat 6/2, Bologna, Italy

More authors (53 more)

Language :

English

Title :

The gaia -ESO survey: Calibration strategy

Publication date :

2017

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences

Volume :

598

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

ST/J001333/1; ST/M001008/1; ST/N003381/1; ST/N004493/1; ST/N005805/1, S

Funders :

SFTC - Science and Technology Facilities Council [GB]

Available on ORBi :

since 16 October 2018

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