Journal Article

The <i>Gaia</i> spectrophotometric standard stars survey — I. Preliminary results<sup>⋆</sup>

E. Pancino, G. Altavilla, S. Marinoni, G. Cocozza, J. M. Carrasco, M. Bellazzini, A. Bragaglia, L. Federici, E. Rossetti, C. Cacciari, L. Balaguer Núñez, A. Castro, F. Figueras, F. Fusi Pecci, S. Galleti, M. Gebran, C. Jordi, C. Lardo, E. Masana, M. Monguió, P. Montegriffo, S. Ragaini, W. Schuster, S. Trager, F. Vilardell and H. Voss

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 3, pages 1767-1781
Published in print November 2012 | ISSN: 0035-8711
Published online November 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21766.x
The Gaia spectrophotometric standard stars survey — I. Preliminary results⋆

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Abstract

We describe two ground-based observing campaigns aimed at building a grid of approximately 200 spectrophotometric standard stars (SPSS), with an internal ≃1 per cent precision and tied to Vega within ≃3 per cent, for the absolute flux calibration of data gathered by Gaia, the European Space Agency (ESA) astrometric mission. The criteria for the selection and a list of candidates are presented, together with a description of the survey strategy and the adopted data analysis methods. We also discuss a short list of notable rejected SPSS candidates and difficult cases, based on identification problems, literature discordant data, visual companions and variability. In fact, all candidates are also monitored for constancy (within ±5 mmag, approximately). In particular, we report on a CALSPEC standard, 1740346, that we found to be a δ Scuti variable during our short-term monitoring (1–2 h) campaign.

Keywords: techniques: photometric; techniques: spectroscopic; catalogues; stars: variables: δ Scuti

Journal Article.  9710 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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