Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..177b&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
In stellar interferometry, the raw fringe visibilities must calibrated to obtain the true visibilities and then observables which can be interpreted as astrophysical parameters. The selection of suitable calibration stars is crucial to obtain the ultimate precision of the interferometric instruments like VLTI. The calibrators must have spectro-photometric properties and sky location close to those of the scientific target. The smaller the calibrators the lesser the sensibility of the angular diameter determination to their intrinsic visibility or sources of instabilities. So, we have developed , we have adopted a method of ?virtual the observatory? type to create an evolutive catalog of stars giving all the useful informations for the selection of calibrators with respect to the requirements of the astrophysical program. The list of possible calibrators is obtained from a set of catalogs available at the Centre de Données astronomiques de Strasbourg (CDS). The CDS request is based on some criteria like angular distance and magnitude around the scientific target. For each star, the squared visibility is computed as function of the wavelength, the maximum baseline and the value of the angular diameter (measured or computed from the colors or spectral type). The accuracy of this visibility of possible calibrators must satisfy constraints fixed by the expected accuracy of the scientific objet visibility and the instrumental configuration. It is possible to refine the choice of the calibrators using selection criteria (sky position, magnitude difference, spectral type, variability and multiplicity). This calibrator selection tool is integrated to ASPRO the interferometric observing preparation software developed by the JMMC.
Bério Ph.
Bonneau Damien
Borde' Pascal
Clausse Jean Michel
Cruzalèbes Pierre
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