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30 Doradus 5000 WAVELENGTH HD absorption albedo Ap.J approximately array Astr B2 IV-V background Boer calculations carbon band channel circumstellar color excess column densities components cooling count rates curve detected disk DISK1 DISK2 dust emission lines emission measure equation estimate feature Figure flux galactic H II region header hydrogen i i i indicated infrared intensity interstellar extinction interstellar medium ionization front km s_1 line profiles luminosity Magellanic Cloud maps mass loss molecular clouds nebula observed optical photons pixel plotted radial velocity radio continuum rate of mass resolution Reticon ridge Savage scans scattering shocked layer spectra spectral type spectrum stars stellar stellar wind Stromgren Table tape temperature ultraviolet University of Wisconsin-Madison Uranus Washburn Observatory WAVELENGTH 5000 HD wavelength calibration X-ray