Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..899w&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 899-904.
Astronomy and Astrophysics
Astronomy
25
B Stars, Interstellar Extinction, Interstellar Gas, Nebulae, Red Shift, Stellar Spectra, Absorption Spectra, Brightness, Interplanetary Dust, Stellar Luminosity, Stellar Spectrophotometry, Ultraviolet Astronomy
Scientific paper
The separation of the observed reddening of HD 200775 into intrinsic and interstellar components is rediscussed in the light of new surface-brightness data for NGC 7023, the reflection nebula surrounding HD 200775. Appropriate correction for the nebular contribution to reported ultraviolet flux measurements of HD 200775 leads to new values due to dust reddening: E(B-V)D = 0.44, and due to intrinsic reddening: E(B-V)I = 0.13-0.26. The newly derived extinction curve for HD 200775 is characterized by an abnormally weak interstellar 2200 A absorption feature, and the deduced nebular brightness in the far-ultraviolet is consistent either with dust in NGC 7023 having a relatively high albedo (a approximately equal to 0.6) and a nearly isotropic phase function (g approximately equal to 0.2), or with low albedo dust (a approximately equal to 0.3) with a forward-throwing phase function (g approximately equal to 0.6).
Cottrell M. J.
Witt Adolf N.
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