Optical extinction in HII regions and nearby bright galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Active Galaxies, Cosmic Dust, H Ii Regions, Interstellar Extinction, Astronomical Observatories, Charge Coupled Devices, Line Spectra, Near Infrared Radiation, Near Ultraviolet Radiation

Scientific paper

Observations with the 1.5 m telescope at ESO, Chile, and the 4.2 m WHT at RGO, La Palma, of galactic HII regions and three galaxies were made to evaluate the potential for Aupsilon determination, using pairs of lines from transitions from common upper levels, and separated by a large wavelength interval. Spectral lines from the near UV to the near IR are shown to be accessible with modern blue-coated CCD detectors.

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