RGU three-colour photometric space densities in a field near the Galactic centre (PLAUT II), compared with different Galaxy models

Details RGU three-colour photometric space densities in a field near the Galactic centre (PLAUT II), compared with different Galaxy models RGU three-colour photometric space densities in a field near the Galactic centre (PLAUT II), compared with different Galaxy models

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...68..397d&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 68, no. 3, March 1987, p. 397-417. SNSF-supported research.

Astronomy and Astrophysics

Astrophysics

27

Astronomical Photometry, Galactic Nuclei, Milky Way Galaxy, Space Density, Spatial Distribution, Star Distribution, Astronomical Models, Galactic Structure, Interstellar Extinction, Stellar Luminosity

Scientific paper

PLAUT II, a 0.09-sq-deg field at l = 4 deg, b = +12 deg, is characterized in the RGU system on the basis of 12 Palomar Schmidt plates obtained in 1977 and measured using the Basel Iris Photometer. Data on 1426 stars with limiting magnitude G less than 18.00 mag are analyzed to obtain G-fractioned two-color diagrams, reddening curves, and density and luminosity functions, and the results are compared with the predictions of theoretical models. Features noted include a thin absorbing screen at distance about 1.1 kpc and z about 250 pc, G-R color excess 0.42 mag, 'disk' and 'halo' space-density functions agreeing best with a four-component Gilmore-Wyse (1985) model with an intermediate thick-disk population, and a mean luminosity function with a steep gradient between underabundant bright and overabundant faint luminosities (relative to the local function of Gliese, 1980). The faint end of the luminosity range is estimated to lie at M(G) = +8.21 mag.

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