Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157...19g&link_type=abstract
The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited
Astronomy and Astrophysics
Astronomy
Interstellar Extinction, Iue, Nebulae, Orion Constellation, Ultraviolet Astronomy, Abundance, Astronomical Netherlands Satellite, Carbon, Oxygen, Silicon
Scientific paper
Both low and high resolution International Ultraviolet Explorer (IUE) observations of the exciting stars of two nebulosities in Orion, NGC 2023 (HD 37903) and M43 (HD 37061) are discussed. Comparison with Astronomical Netherlands Satellite (ANS) observations shows that, in the 2.5 min X 2.5 min ANS field of view, a substantial nebular contribution is included. The extinction curve for HD 37903 is smilar to that of the inner region of the rho Oph cloud whereas for HD 37061 it is even lower throughout UV with the normalized extinction at 2200 being only 3.8. It appears that the ratio of small aperture to large aperture data is not wavelength independent in the long wavelength range. From the high resolution observations it seems that carbon may be less and oxygen may be more under/abundant in these directions.
Arnal Marcelo E.
de Vries Jellie
Gilra Daya P.
Pottasch Stuart R.
Wesselius R.. P.
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