Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26as...57..225f&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 57, Aug. 1984, p. 225-232. Research supported by the Swiss N
Astronomy and Astrophysics
Astrophysics
1
Astronomical Photometry, Galactic Structure, Milky Way Galaxy, Stellar Color, Density Distribution, Interstellar Extinction, Late Stars, Main Sequence Stars, Star Distribution
Scientific paper
In order to investigate space densities in the outer regions of the Milky Way, a series of relatively small starfields (less than about 0.5 sq deg) have been observed with the Basle RGU three-color photometry system. Observations of the field were made in an anticenter direction, and reddening, density and luminosity functions were determined for about 1700 stars. Several G-fractioned two-color diagrams indicated moderate to heavy interstellar absorption corresponding to color excesses in two absorbing screens. Absolutely bright stars of the group M(G) (less than 0 m) were detected as far away as 20 kpc from the sun. Logarithmic space density functions were determined for late-type giants and for main-sequence stars of population I for different intervals in maximum magnitude. The density function for the late-type stars exceeded that of the main-sequence stars starting at 2 kpc and continued to increase with distance from the sun. The luminosity functions for the distance intervals 0.6 to 1.6 kpc and 1.6 to 4 kpc were found to correspond to those of a previous study. The data are recorded in a series of tables.
Fenkart R.
Karaali Salih
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