Eric B. Burgh et al. 2002 ApJ 575 240 doi:10.1086/341194
Eric B. Burgh1,2, Stephan R. McCandliss1 and Paul D. Feldman1
Show affiliationsThe reflection nebula NGC 2023 was observed by a rocket-borne long-slit imaging spectrograph in the 900-1400 Å 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 ~ 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.
dust, extinction; ISM: individual (NGC 2023); reflection nebulae; ultraviolet: ISM
Issue 1 (2002 August 10)
Received 2002 January 5, accepted for publication 2002 April 12
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