Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26as...43..239k&link_type=abstract
Astronomy and Astrophysics Supplement, Vol. 43, P. 239, 1981
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
The interstellar reddening, the space densities and the luminosity functions have been studied in a field of 0.28 square degrees in the Norma region (lm = 327°8, b = 0°8) using 1501 stars with the limiting magnitude of G = 17m.0.Two absorbing clouds of < 450 pc and 1300 pc distance are found in the field. In distances > 5 kpc the reddening increases rapidly. The density functions for stars with M(G) < 0m indicate a maximum density between 1 kpc and 2 kpc when the line of sight passes the next inner spiral arm (-I). The density minimum between the sun and that maximum is not covered by observations. The density function for stars with 0m < M (G) < 2m and for late type giants indicates also a maximum between 1 kpc and 2 kpc. The stars with 2m < M (G) < 5m show up to the limits of completeness a density not different from the densities in the solar neighbourhood. For stars with 5m < M(G) < 7m the densities are about three times larger than the last ones. The luminosity function for the interarm region (0.6 - 1.0 kpc) is almost the same as for the solar neighbourhood for stars with 2m < M(G) < 6m. For the spiral arm region (1 - 2 kpc) the luminosity function extends to stars with M(G) = -3m and is more flat.
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