Ultraviolet interstellar extinction toward stars in the Orion Nebula and toward HD 147889

Details Ultraviolet interstellar extinction toward stars in the Orion Nebula and toward HD 147889 Ultraviolet interstellar extinction toward stars in the Orion Nebula and toward HD 147889

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..109b&link_type=abstract

Astrophysical Journal, Part 1, vol. 249, Oct. 1, 1981, p. 109-117.

Astronomy and Astrophysics

Astronomy

124

Interstellar Extinction, Orion Nebula, Spectral Energy Distribution, Stellar Spectra, Stellar Spectrophotometry, Ultraviolet Spectra, Cosmic Dust, Early Stars, Interstellar Matter, Iue, Spaceborne Astronomy, Stellar Radiation

Scientific paper

The International Ultraviolet Explorer (IUE) was used to obtain low resolution absolute ultraviolet energy distributions for the four Trapezium stars Theta(1) Orionis A, B, C, and D, Theta(2) Orionis A and B, HD 147889, and several unreddened standard stars. The observations for Theta(1) Orionis B reveal a peculiar extended object. The measurements for the rest of the stars were used to derive UV extinction curves. The derived curves are very different from the average galactic curve. The curves for the Orion stars all exhibit smaller than normal middle and far-UV extinctions. Although a 2175 A feature is present, its strength, when normalized to E(B-V), is smaller than in the average galactic curve. In contrast, the curve for HD 147889 has a pronounced 2175 A feature followed by smaller than normal extinction for an inverse wavelength between 5 and 7 per micron.

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