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Gaia spectro-photometry absolute calibration and comparison toclassical systems

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou  and
C. Cacciari
C. Cacciari*
Affiliation:
INAF, Osservatorio Astronomico, via Ranzani 1, 40127 Bologna, Italy. e-mail: [email protected]
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Abstract

The Gaia spectro-photometric data consist of white-light G magnitudes from unfilteredfluxes measured in the astrometric field CCDs, and low resolution prism spectra measuredin the blue (BP) and red (RP) CCDs. The integrated flux of these BP and RP spectra willyield GBP and GRP magnitudes astwo broad passbands. The internal flux calibration will correct for all possibleinstrumental effects and produce mean spectral energy distributions in an internallydefined flux scale. The purpose of the absolute flux calibration is to tie this flux scaleto physical units by means of spectro-photometric standard stars that rely ultimately onVega’s absolute flux scale. The characteristics of the Gaia spectrophotometric system willbe described, and the absolute calibration process will be outlined and compared withexamples of classical systems.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 155 - 160
Copyright
© EAS, EDP Sciences 2011

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References

Références

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