Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305l..23w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 305, June 1, 1986, p. L23-L27.
Astronomy and Astrophysics
Astronomy
27
Astronomical Spectroscopy, Interstellar Extinction, Interstellar Matter, Reflection Nebulae, Ultraviolet Astronomy, Cosmic Dust, Electromagnetic Scattering, Far Ultraviolet Radiation, Iue, Spectral Bands, Spectrophotometry
Scientific paper
Spectrophotometric observations of two reflection nebulae and their illuminating stars obtained with the International Ultraviolet Explorer Satellite have provided the first evidence for the presence of a scattering contribution to the 2175 A interstellar extinction band. Lower than normal far-UV extinction for the stars embedded in the nebulae indicates that the nebulae have a dust particle size distribution that is dominated by larger particles. The strength of the 2175 A band is larger than normal in both cases. The scattering is found to dominate the long-wavelength wing of the band, without shifting the central wavelength of the band by more than 20 A toward longer wavelengths. These observations are taken to indicate that the solid particles responsible for the 2175 A band can be considerably larger than the Rayleigh limit in some interstellar locations. The absence of a notable shift in the central wavelength of the band in such large particles presents a new severe constraint for models of interstellar grains.
Bohlin Ralph Charles
Stecher Theodore P.
Witt Adolf N.
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