Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..183g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 195, Apr. 1981, p. 183-196.
Astronomy and Astrophysics
Astronomy
37
Astronomical Models, Milky Way Galaxy, Quasars, Star Distribution, Stellar Magnitude, Astrometry, Hertzsprung-Russell Diagram, M Stars, Star Clusters, Stellar Luminosity, Stellar Spectra, White Dwarf Stars
Scientific paper
Although the available information on star counts and colors at faint apparent magnitudes permits testing of Galaxy models, uncertainties in the galactic structure parameters and inconsistencies between various counts preclude the choice of a definitive model. Observations of the number-magnitude-color diagram in several galactic coordinates and several colors are recommended as a more adequate constraint on available models, than total star counts in a single color but many directions. In addition, the bimodal nature of the stellar number-magnitude-color diagram for - 19 approximately smaller MB approximately smaller 2.4 - is covered, deriving a limit on the surface density of blue quasars which is two orders of magnitude less than the one obtained by Bohuski and Weedman (1979).
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