THE MORPHOLOGY OF THE STARS, ATOMIC GAS, AND IONIZED-GAS IN THE BARRED SPIRAL GALAXY NGC-1530

We present observations of the barred spiral galaxy NGC 1530 that we u se to investigate the overall structure and gas content of the galaxy. We use sensitive H alpha Fabry-Perot observations of the ionized gas to determine the star forming rates in various regions of the galaxy. Westerbork H I observations are used to investigate the morphology of the atomic gas and combined with the H alpha Fabry-Perot to determine the rotation curve. From the rotation curve we derive a pattern speed of the bar of approximately 20 km s(-1) kpc(-1) that predicts resonanc es at locations that coincide with prominent morphological features, i ncluding three gaseous rings mapped in these observations: an outer ri ng of atomic hydrogen at a radius consistent with the outer Lindblad r esonance, an inner ring seen in both atomic hydrogen and H alpha, and a nuclear ring of dust and molecular gas. These rings combined with th e very strong spiral arms dominate the morphology of the galaxy. (C) 1 996 American Astronomical Society.