Model-compared RGU-photometric space density gradients in the intermediate-latitude field NGC 2403

Details Model-compared RGU-photometric space density gradients in the intermediate-latitude field NGC 2403 Model-compared RGU-photometric space density gradients in the intermediate-latitude field NGC 2403

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...74..251f&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 74, no. 2, Aug. 1988, p. 251-264. SNSF-supported research.

Astronomy and Astrophysics

Astrophysics

5

Astronomical Photometry, Space Density, Spiral Galaxies, Star Distribution, Color-Color Diagram, Dwarf Stars, Giant Stars, Late Stars

Scientific paper

The total logarithmic space density histograms for late-type giants and for dwarfs falling into consecutive 1m-intervals of absolute magnitude within the MG-calibrated regions in the RGU-two-colour diagram have been determined according to the standard method of the Basle programs in the direction of the intermediate-latitude field NGC 2403 (l = 151°, b = +29°) and plotted into figures. They are quantitatively compared to the theoretical gradients predicted for this direction by a representative set of multi-component models. A detailed discussion of the comparison results with respect to the differing behaviour of the used model gradients in different distance ranges again strongly suggests the existence of a thick disk component. On the basis of an extrapolation of the results obtained within the MG-calibrated region of the two-colour diagram (MG ≤ +8m), the dwarfs beyond this limit which represent about 30% of all treated stars, can be included into the discussion.

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