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Title:
SearchCal: a virtual observatory tool for searching calibrators in optical long baseline interferometry. I. The bright object case
Authors:
Bonneau, D.; Clausse, J.-M.; Delfosse, X.; Mourard, D.; Cetre, S.; Chelli, A.; Cruzalèbes, P.; Duvert, G.; Zins, G.
Affiliation:
AA(Observatoire de la Côte d'Azur, Dpt. Gemini, UMR 6203, 06130 Grasse, France ), AB(Observatoire de la Côte d'Azur, Dpt. Gemini, UMR 6203, 06130 Grasse, France), AC(Laboratoire d'Astrophysique de l'Observatoire de Grenoble, UMR 5571, 38041 Grenoble, France), AD(Observatoire de la Côte d'Azur, Dpt. Gemini, UMR 6203, 06130 Grasse, France), AE(Laboratoire d'Astrophysique de l'Observatoire de Grenoble, UMR 5571, 38041 Grenoble, France), AF(Laboratoire d'Astrophysique de l'Observatoire de Grenoble, UMR 5571, 38041 Grenoble, France), AG(Observatoire de la Côte d'Azur, Dpt. Gemini, UMR 6203, 06130 Grasse, France), AH(Laboratoire d'Astrophysique de l'Observatoire de Grenoble, UMR 5571, 38041 Grenoble, France), AI(Laboratoire d'Astrophysique de l'Observatoire de Grenoble, UMR 5571, 38041 Grenoble, France)
Publication:
Astronomy and Astrophysics, Volume 456, Issue 2, September III 2006, pp.789-789 (A&A Homepage)
Publication Date:
09/2006
Origin:
EDP Sciences
Astronomy Keywords:
instrumentation: high angular resolution, instrumentation: interferometric, stars: fundamentals parameters, catalogs, astronomical database: miscellaneous
DOI:
10.1051/0004-6361:20054469
Bibliographic Code:
2006A&A...456..789B

Abstract

Context: .In long baseline interferometry, the raw fringe contrast must be calibrated to obtain the true visibility and then those observables that can be interpreted in terms of astrophysical parameters. The selection of suitable calibration stars is crucial for obtaining the ultimate precision of interferometric instruments like the VLTI. Potential calibrators must have spectro-photometric properties and a sky location close to those of the scientific target.
Aims: .We have developed software (SearchCal) that builds an evolutive catalog of stars suitable as calibrators within any given user-defined angular distance and magnitude around the scientific target. We present the first version of SearchCal dedicated to the bright-object case (V≤10; K≤5).
Methods: .Star catalogs available at the CDS are consulted via web requests. They provide all the useful information for selecting of calibrators. Missing photometries are computed with an accuracy of 0.1 mag and the missing angular diameters are calculated with a precision better than 10%. For each star the squared visibility is computed by taking the wavelength and the maximum baseline of the foreseen observation into account.
Results: .SearchCal is integrated into ASPRO, the interferometric observing preparation software developed by the JMMC, available at the address: http://mariotti.fr.
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