The significance of deep star counts for models of the Galaxy and the surface density of faint quasars

Astronomy and Astrophysics – Astronomy

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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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