Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177..195g&link_type=abstract
In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 195-198 (SEE N82-30146 20-88)
Astronomy and Astrophysics
Astronomy
Astrometry, B Stars, Esa Satellites, Interstellar Extinction, Star Distribution, Star Trackers, Galactic Evolution, Interstellar Chemistry, Interstellar Gas, Interstellar Matter, Spatial Distribution, Stellar Evolution
Scientific paper
The uses of interstellar reddening data for studying the location and geometry of interstellar clouds, properties of dust grains, interstellar chemistry, spatial distribution of dust and stars, galactic structure, and star formation, are reviewed. Contributions to these studies by the Hipparcos satellite, and Tycho experiment (transmitting the Hipparcos star mapper photon records to the ground) are summarized. Within 100 to 200 parsecs froms the Sun, Hipparcos trigonometric parallaxes enable stars and reddening material to be located to within a few percent accuracy. Hipparcos provides accurate absolute magnitude calibrations within a few 100 parsecs. Tycho, plus MK classifications, maps the distributions of dust and hot stars up to 2 k parsecs ( 40,000 B A0 stars).
Egret Daniel
Guibert Jean
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