Astrometry from space was performed for the first time and with great success by the ESA Hipparcos satellite (1989-93). This mission was designed as an as trometry mission, but the use of a photon counting detector made it possible to produce very important photometric results: the most accurate astronomical pho tometry ever by the main Hipparcos mission in a very broad band of 120000 stars, and the two-colour Tycho-2 photometry of 2.5 million stars. The cornerstone ESA mission GAIA was approved in October 2000 for launch not later than 2012. This mission will use CCDs in time-delayed integration mode instead of the photo-cathode detectors used in Hipparcos. Due to the higher quantum efficiency of the CCDs, simultaneous integration of many stars, and larger tele scope apertures GAIA will utilize the star light a million times more efficiently than Hipparcos, resulting in astrometry and multi-colour photometry for one billion stars. GAIA photometry is crucial for the scientific utilization of the astrometric results, and the photometric data have a high scientific content in themselves.
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Dateigröße
ISBN-13
978-94-010-0361-2 (9789401003612)
DOI
10.1007/978-94-010-0361-2
Schweitzer Klassifikation
GAIA: An astrometric and photometric survey of our galaxy.- GAIA: Photometry.- GAIA photometry: Selected topics.- Determination of stellar parameters with GAIA.- GAIA photometric system: Evaluation of performance.- GAIA photometric system: Simultaneous 4-D parameterization.- GAIA photometric system: Simulation of photometric observations.- The spectro point spread function for GAIA.- On the tolerances of filters for GAIA medium band photometric system.- Bandwidth effects in the 3G photometric system.- Transformations between Vilnius and Strömgren photometric systems.- Systematic errors of high-precision photometric catalogues.- The Asiago Database on Photometric Systems (ADPS) and the design of the GAIA photometric system.- BaSeL: A library of synthetic spectra and colours for GAIA.- Japanese astrometry satellite mission for infrared exploration.- GAIA: Astrophysical Issues.- Methods to account for interstellar extinction.- 3-D structure of the galactic interstellar matter: A contribution from GAIA.- A synthetic map of the galactic interstellar extinction.- Diffuse interstellar band at 862 nm as a reddening tracer for GAIA.- GAIA and population II visual binaries.- Unresolved binaries and the initial mass function.- Binary star detection with the GAIA radial velocity spectrometer.- Detection of extra-solar planets by GAIA photometry.- ?-Process elements in the galaxy: A possible GAIA contribution.- Asymptotic giant branch stars as tracers of star formation histories: the GAIA context.- Globular clusters in the large magellanic cloud: An impact from GAIA photometry.- GAIA and the extragalactic distance scale.- Discussion.- Ground based testing of the GAIA filters.- General discussion and photometric system for GAIA.
