Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...408l..97m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 408, no. 2, p. L97-L100.
Astronomy and Astrophysics
Astrophysics
15
Albedo, Interstellar Matter, Light Scattering, Nebulae, Ultraviolet Photography, Ultraviolet Telescopes, Airglow, Interstellar Extinction, Ultraviolet Spectra
Scientific paper
We have obtained the first sub-Ly-alpha spectroscopic observations of the reflection nebula NGC 7023 and its illuminating star, HD 200775, using the Hopkins UV Telescope during the Astro-1 mission in December, 1990. The ratio of the nebular to stellar flux is virtually flat between 1100 and 1860 A, indicating that sigma(a), the cross section for absorption, must rise sharply with decreasing wavelength. Independent of any model, this means that much of the far-UV rise in the extinction curve is due to an increase in absorption rather than scattering. If, in addition, we assume a spherical geometry, we derive an albedo of 0.5 at 1100 A with somewhat higher values at longer wavelengths. If the geometry is not spherical, lower values of the albedo may be obtained.
Blair William Patrick
Dring Andrew
Durrance Samuel T.
Henry Richard C.
Kimble Randy A.
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