Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177..133j&link_type=abstract
In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 133-135 (SEE N82-30146 20-88)
Astronomy and Astrophysics
Astronomy
1
Astrometry, Esa Satellites, Satellite Observation, Star Trackers, Stellar Spectrophotometry, Accuracy, Astronomical Catalogs, Astronomical Maps, Broadband, Eclipsing Binary Stars, Stellar Magnitude, Variable Stars
Scientific paper
The coverage in sky surface and magnitude, and the accuracy of photometric survey catalogs are discussed. Knowledge of variable and eclipsing binary stars is reviewed. The use of broadband B and V filters for Tycho is advocated. Coverage is complete up to magnitude 9, but accuracy is very poor, with no homogeneous coverage in visual or photometric magnitude to within even 10% accuracy. Lack of accuracy makes the number of variables in surveys difficult to estimate. Tycho is expected to detect several dozen Cepheids and RR Lyrae, several hundred long-period variables, and several thousand short-period ones. Discoveries of eclipsing binaries, even in the magnitude range from 1 to 5, are predicted.
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