Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...51..213f&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 51, Feb. 1983, p. 213-218. Research supported by the Swiss National Science
Astronomy and Astrophysics
Astrophysics
6
Astronomical Photometry, Galactic Nuclei, Galactic Structure, Late Stars, Main Sequence Stars, Southern Sky, Astrometry, Galactic Bulge, Hertzsprung-Russell Diagram, Stellar Luminosity
Scientific paper
1603 stars have been measured on 48arcsec Palomar Schmidt RGU plates down to the limiting magnitudes 14m.96 (R), 16m.00 (G) and 19m.35 (U) in a field of 0.432 □° in SA 158 (l = 3°.7, b = -8°.8), practically symmetrical with respect to the galactic equator to Beckers (1979) field in SA 133 (l = 6°.5, b = +10°.3). The qualitative, as well as the quantitative results turn out to be very similar in both directions, i.e.: the colour-magnitude diagrams show a striking predominance of late-type giants of both populations and almost no population II main-sequence stars. They are all reddened by a constant amount of 0m.15 in G-R, caused by an absorbing screen within 500 pc from the sun. The resulting density-functions for late-type giants and for population I main-sequence stars are shown. As far as possible, the SA 158 densities have been compared with the ones in SA 133.
Becker Walter
Fenkart R. P.
Topaktas L.
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