Showing papers by "Edwin A. Valentijn published in 1989"
Journal Article•
TL;DR: Most of the results of the extensive project on the surface photometry of the 16,000 ESO-Uppsala galaxies are now publicly available as discussed by the authors, and they can be used to obtain a detailed description of the surface properties of the galaxies.
Abstract: We are happy to announce that most of the results of our extensive project on the surface photometry of the 16,000 ESO-Uppsala galaxies are now publicly available.
17 citations
TL;DR: In this paper, surface photometry has been obtained inJ and K for 12 giant elliptical galaxies, where ellipses have been fitted to obtain luminosity, ellipticity, and major axis position angle profiles.
Abstract: Accurate surface photometry has been obtained inJ andK for 12 giant elliptical galaxies. Ellipses have been fitted, to obtain luminosity, ellipticity, and major axis position angle profiles. The results have been combined with visual profiles from CCD observations. We find that elliptical galaxies become bluer inV - K on the average by 0.3 (mag/sq″ xre) going outward from the nucleus. Radial colour gradients inV - K correlate strongly with those inU - V andB - V. By modelling, using theoretical isochrones, it is found that the observed colour gradients can be explained by a gradient in metallicity, if in addition the proportion of hot stars rises very rapidly with decreasing metallicity.
7 citations