Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975aj.....80...31r&link_type=abstract
Astronomical Journal, vol. 80, Jan. 1975, p. 31-36.
Astronomy and Astrophysics
Astronomy
13
Astronomical Photometry, Cosmic Dust, Fluorescence, Interstellar Radiation, Nebulae, Optical Reflection, Astronomical Photography, Continuous Radiation, Light Scattering, Spectrophotometry, Stellar Radiation, Variable Stars
Scientific paper
Photometric and spectrophotometric observations have been made of the reflection nebulae NGC 1435, NGC 2068, NGC 7023, and IC 1287 in an attempt to detect continuous fluorescence by dust grains. Several effects of importance for observations of such faint objects are discussed, including instrumental light scattering, a photographic effect, and a time-delay effect which can occur if the illuminating star is a spectrum variable. It is found that continuous fluorescence by interstellar grains is not likely to exist and that it cannot account for more than 10% of the total surface brightness of these reflection nebulae. No evidence of diffuse interstellar features is found in the spectra of these nebulae.
Rush William F.
Witt Adolf N.
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