Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19915102b&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #151.02; Bulletin of the American Astronomical Society, Vol. 33, p.1531
Astronomy and Astrophysics
Astronomy
Scientific paper
The reflection nebula NGC 2023 was observed by a rocket-borne long-slit imaging spectrograph in the 900--1400 Å bandpass on 11 Feb 2000. A spectrum of the central star, HD 37903, 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 ~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. This work was supported by NASA grant NAG5-5122 to the Johns Hopkins University.
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