Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.217...77t&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 217, no. 1-2, p. 77-82
Astronomy and Astrophysics
Astronomy
Astronomical Photometry, Red Dwarf Stars, Sky Surveys (Astronomy), Stellar Evolution, Stellar Luminosity, Stellar Magnitude, Stellar Models, Stellar Rotation, Accuracy, Data Reduction, Graphs (Charts), Hipparcos Satellite, Variable Stars
Scientific paper
The European Space Agency's Hipparcos satellite, launched in August 1989, and operated until August 1993, sent back scientific data for about 36 months. The reduction of the first 18 months already shows that the target accuracy for the five astrometric parameters of each star (0.002 arcsec for the position and annual proper motion components, and for the parallax) and for the photometric data (a few milli-magnitudes) will be achieved or even exceeded for most of the 118,000 pre-selected program stars. These preliminary results will be presented. The contents of the Hipparcos observing program with respect to red stars and anticipated improvements in the study of red dwarfs will be underlined.
Crifo Francoise
Morin David
Turon Catherine
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