Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..175c&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 175-178 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
Cosmic Dust, Extinction, Herbig-Haro Objects, Nebulae, Iue, Stellar Evolution, T Tauri Stars, Ultraviolet Astronomy
Scientific paper
Observations of the reflection nebula NGC 1999 (taken at a small offset angle) and its illuminating star V380 Ori were used to examine the properties of dust in the region of Herbig-Haro objects H-H 1 and H-H 2. The ratio of nebular intensity to stellar flux is fairly flat in the UV and is remarkably similar to that for NGC 7023/HD 200775 for small offset angles. If reflected light represents a strong contribution to the continua of H-H objects, then the results seem to rule out geometries in which this reflection arises from forward scattering of light from imbedded T Tauri stars. In addition, the extinction to V380 Ori was examined and found to be similar to the curve for HD 200775, both of which are lower than the average galactic extinction curve in the UV. This seems to justify the use of extinction curves like theta Ori for correcting the observations of H-H objects, particularly H-H 1 and 2, for reddening.
Bohm Karl-Heinz
Cardelli Jason A.
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