Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26as...57...23k&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 57, July 1984, p. 23-30. Reserach supported by the Swiss Nat
Astronomy and Astrophysics
Astrophysics
6
Galactic Clusters, Star Distribution, Stellar Spectrophotometry, Astronomical Catalogs, Astronomical Photography, Astronomical Photometry, Galactic Structure, Giant Stars, Late Stars, Main Sequence Stars, Space Density, Stellar Luminosity, Stellar Magnitude
Scientific paper
A photographic three-color photometry in the RGU system has been carried out in a field of 3.56 square degrees containing a large fraction of the Praesepe cluster, with 1500 stars down to the limiting magnitude of 16.2. No interstellar absorption was detected in this direction. Space density functions were determined for late-type giants and for main sequence stars of photometric populations I and II. The population I densities are compared with the ones for the solar neighborhood at corresponding z-distances. The population II densities are higher, and their gradients are somewhat steeper than in the direction to SA 54. The luminosity functions for population I main sequence stars have been determined for the distance intervals 0 to 0.2 kpc and 0.2 to 0.4 kpc and are compared with the one for the solar neighborhood.
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