Far-red surface photometry of the X-ray emitting BL Lacertae object PKS 0548-322
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Weistrop, D.↗
Engineering topics
Weistrop, D.
Publications and source records attributed to Weistrop, D..
A new upper limit to the local population II density.
An upper limit to the local population II density is derived, in terms of the mass-luminosity ratio, on the basis of U, B, and V photometric observations of several thousand stars with V magnitudes between 12 and 18 in a region near the North Galactic Pole. The photographic and photoelectric photometry and the reduction procedures are discussed. Models of the density distribution and luminosity function of the population II stars are used to predict their distribution in color and apparent magnitude. The derived local density of population II is found to be significantly lower than previous estimates. Possible causes for this discrepancy are considered.
Weistrop, D.↗