Summary: Mon. Not. R. Astron. Soc. 367, 16861688 (2006) doi:10.1111/j.1365-2966.2006.10071.x
Far-ultraviolet scattering by dust in Orion
N. V. Sujatha,1
Richard Conn Henry2
and David J. Sahnow2
1Indian Institute of Astrophysics, Bangalore 560034, India
2Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
Accepted 2006 January 11. Received 2005 December 20; in original form 2005 October 21
We have modelled diffuse far-ultraviolet (FUV) spectrum observed by the Far Ultraviolet
Spectroscopic Explorer (FUSE) near M42 as the scattering of the starlight from the Trapezium
stars by dust in front of the nebula. The dust grains are known to be anomalous in Orion with
RV = 5.5 and these are the first measurements of the FUV optical properties of the grains
outside of `normal' Milky Way dust. We find an albedo varying from 0.3 ± 0.1 at 912 Å to
0.5 ± 0.2 at 1020 Å which is consistent with theoretical predictions.
Key words: dust, extinction ultraviolet: ISM.
The Orion Nebula (M42) was first observed as one of the brightest