Showing papers by "Stuart D. Ryder published in 1991"
TL;DR: In this paper, the initial results of a flux-calibrated CCD Ha imaging program of bright, nearby southern spiral galaxies are presented, which mainly uses the MSSSO 1.0m reflector with an f/3.5 focal reducer.
Abstract: A b s t r a c t : Some initial results of a flux-calibrated CCD Ha imaging program of bright, nearby southern spiral galaxies are presented. Very few southern hemisphere spiral galaxies have ever been completely imaged in Ha, let alone with a CCD. This survey (which mainly uses the MSSSO 1.0-m reflector with an f/3.5 focal reducer) will, when combined with spectrophotometry of the H II regions thus revealed, allow us to trace the chemical evolution of each galaxy. Furthermore, since the absolute Ha flux is a reliable measure of the high-mass star formation rate in a galaxy, such observational data will permit us to test the predictions of the various star formation theories.