Journal
ASTROPHYSICAL JOURNAL
Volume 575, Issue 1, Pages 240-249Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/341194
Keywords
dust, extinction; ISM : individual (NGC 2023); reflection nebulae; ultraviolet : ISM
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The reflection nebula NGC 2023 was observed by a rocket-borne long-slit imaging spectrograph in the 900-1400 Angstrom bandpass on 2000 February 11. A spectrum of the star, as well as that of the nebular scattered light, was recorded. Through the use of a Monte Carlo modeling process, the scattering properties of the dust were derived. The albedo is low, 0.2-0.4, and decreasing toward shorter wavelengths, while the phase function asymmetry parameter is consistent with highly forward-scattering grains, g similar to 0.85. The decrease in albedo, while the optical depth increases to shorter wavelengths, implies that the far-UV rise in the extinction curve is due to an increase in absorption efficiency.
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