Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..276p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 1, p. 276-282.
Astronomy and Astrophysics
Astrophysics
2
Color-Color Diagram, Interstellar Extinction, Interstellar Matter, Nebulae, Stellar Spectra, Astronomical Spectroscopy, Cosmic Dust, Electromagnetic Scattering
Scientific paper
The spectrum of the southern reflection nebula VHE 65a has been observed from 4000 to 9250 A with a resolution of 16 A. The ratio of the nebular flux and the flux of the illuminating star is found to increase monotonically with wavelength with a very steep gradient in the red: the intensity at 9000 A is 20 times as large as that measured at 4500 A, thus making this object the reddest known reflection nebula - insofar as the nebula and the star are equally affected by interstellar reddening. An explanation that could account for this exceptionally red object could be simply given in terms of scattering by large (micron-sized) grains of organic materials or by large grains of silicate with an organic coating, assuming in all cases that the illuminating star is located in the foreground of the dust cloud.
Perrin Jean-Marie
Sivan Jean-Pierre
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