Revised Listing - S201 Far-Ultraviolet Atlas of the Large Magellanic Cloud

摘要

Far-ultraviolet electrographic images, covering the wavelength ranges 1050 to 1600 angstroms and 1230 to 1600 angstroms, were obtained of the Large Magellanic Cloud during the Apollo 16 mission with the NRL Far-Ultraviolet Camera/Spectrograph (Experiment S201). The images were analyzed as described in the 'S201 Far-Ultraviolet Atlas of the Large Magellanic Cloud' (NRL Report 8206), and the 'Revised S201 Catalog of Far-Ultraviolet Objects' (NRL Report 8487). The listing of far-UV objects in the LMC provided here is improved in quantitative accuracy and completeness compared to that originally provided in NRL Report 8206. These improvements include more accurate estimates of interstellar extinction corrections, comparisons with more sensitive ground-based H alpha emission measurements, and calibration of the S201 photometry by comparison with OAO-2 photometry of objects in common. The listing presents ultraviolet brightnesses, measured on one or more of four frames (two 1050 - 1600 angstroms and two 1250 - 1600 angstroms exposures), for 473 objects or gruopings of objects in the LMC. Also listed, where available, are H alpha brightnesses of associated nebulosities, and values of hydrogen index (defined as ratio of H alpha brightness to far-UV brightness, both corrected for interstellar extinction). (Author)