Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...69...33f&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 69, no. 1, April 1987, p. 33-56. SNSF-supported research.
Astronomy and Astrophysics
Astrophysics
17
Astronomical Photometry, Color-Magnitude Diagram, Galactic Structure, Main Sequence Stars, Space Density, Stellar Luminosity, Histograms, Stellar Structure
Scientific paper
A high-latitude field containing M 101 has been studied with the standard RGU three-color photometric methods down to a limiting magnitude in G of 19.5 mag, and by evaluating the G-fractioned Two-Color diagrams, logarithmic space-density histograms have been derived for disk-main sequence and halo-main-sequence stars of different 1-mag intervals in MG, for main-sequence stars of different 1-mag intervals in MG, and for late-type giants. The best fit with predictions is found for the model of Gilmore and Wyse (1985), including the intermediate-population thick disk for all histograms. The resulting logarithmic luminosity-function is extrapolated to the MG range greater than 7.5 mag for determination of the luminosity range of the M-greater-than-8 stars.
Fenkart R.
Karaali Salih
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