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Proceedings Paper

High-precision astrometry towards ELTs
Author(s): Davide Massari; Giuliana Fiorentino; Eline Tolstoy; Alan McConnachie; Remko Stuik; Laura Schreiber; David Andersen; Yann Clénet; Richard Davies; Damien Gratadour; Konrad Kuijken; Ramon Navarro; Jörg-Uwe Pott; Gabriele Rodeghiero; Paolo Turri; Gijs Verdoes Kleijn
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Paper Abstract

With the aim of paving the road for future accurate astrometry with MICADO at the European-ELT, we performed an astrometric study using two different but complementary approaches to investigate two critical components that contribute to the total astrometric accuracy. First, we tested the predicted improvement in the astrometric measurements with the use of an atmospheric dispersion corrector (ADC) by simulating realistic images of a crowded Galactic globular cluster. We found that the positional measurement accuracy should be improved by up to ∼ 2 mas with the ADC, making this component fundamental for high-precision astrometry. Second, we analysed observations of a globular cluster taken with the only currently available Multi-Conjugate Adaptive Optics assisted camera, GeMS/GSAOI at Gemini South. Making use of previously measured proper motions of stars in the field of view, we were able to model the distortions affecting the stellar positions. We found that they can be as large as ∼ 200 mas, and that our best model corrects them to an accuracy of ∼ 1 mas. We conclude that future astrometric studies with MICADO requires both an ADC and an accurate modelling of distortions to the field of view, either through an a-priori calibration or an a-posteriori correction.

Paper Details

Date Published: 26 July 2016
PDF: 13 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99091G (26 July 2016); doi: 10.1117/12.2232478
Show Author Affiliations
Davide Massari, INAF - Osservatorio Astronomico di Bologna (Italy)
Univ. of Groningen (Netherlands)
Giuliana Fiorentino, INAF - Osservatorio Astronomico di Bologna (Italy)
Eline Tolstoy, Univ. of Groningen (Netherlands)
Alan McConnachie, Herzberg Astronomy and Astrophysics, National Research Council Canada (Canada)
Remko Stuik, Leiden Observatory (Netherlands)
Laura Schreiber, INAF - Osservatorio Astronomico di Bologna (Italy)
David Andersen, Herzberg Astronomy and Astrophysics, National Research Council Canada (Canada)
Yann Clénet, LESIA, Observatoire de Paris, CNRS, UPMC, Univ. Paris-Diderot (France)
Richard Davies, Max-Planck-Institut für extraterrestrische Physik (Germany)
Damien Gratadour, LESIA, Observatoire de Paris, CNRS, UPMC, Univ. Paris-Diderot (France)
Konrad Kuijken, Leiden Observatory (Netherlands)
Ramon Navarro, NOVA (Netherlands)
Jörg-Uwe Pott, Max-Planck-Institut für Astronomie (Germany)
Gabriele Rodeghiero, Max-Planck-Institut für Astronomie (Germany)
Paolo Turri, Univ. of Victoria (Canada)
Gijs Verdoes Kleijn, Univ. of Groningen (Netherlands)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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