Simulated dispersed fringes of an astrometric interferometry mission

Details Simulated dispersed fringes of an astrometric interferometry mission Simulated dispersed fringes of an astrometric interferometry mission

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..815s&link_type=abstract

In: B. Battrick, M.A.C. Perryman and P.L. Bernacca (eds.): HIPPARCOS '97. Presentation of the Hipparcos and Tycho catalogues and

Astronomy and Astrophysics

Astrophysics

Scientific paper

Several astrometric space interferometry mission projects (e.g. GAIA, FAME, DIVA) for scanning the sky in a similar fashion as Hipparcos are currently being discussed. Their raw detector signals will be dispersed interferometer fringes. This new type of signal will be directly recorded by CCD mosaics in drift-scan mode in the focal plane of Fizeau interferometers. The astrometric measurement, i.e. the determination of the one-dimensional relative position of the fringe pattern, perpendicular to the fringes (i.e. in the direction of the sky scan), and the extraction of the spectro-photometric information contained in the direction of the dispersion of the fringes (i.e. perpendicular to the sky scan) need a complex reduction technique. We report on the simulation of polychromatic dispersed fringe patterns of stars with different spectra taken from spectrophotometric libraries using the presently envisaged parameters of the DIVA instrument. The stellar signal was combined with expected dark current and sky background and then transformed according to Poisson distribution. The assumed read-out noise of the CCD was added. The resulting images will be used for the development of algorithms for the combined astrometric and spectro-photometric reduction.

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