The ultraviolet spectrum of Herbig-Haro Object 1

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Herbig-Haro Objects, Stellar Spectra, Ultraviolet Spectra, Emission Spectra, Interstellar Extinction, Iue, Line Spectra, Spectral Energy Distribution, Stellar Luminosity

Scientific paper

Continuum and emission line fluxes for HH 1 in the range of 1200-1300 A have been determined using IUE spectra, and it is found that the luminosity of HH 1 in this wavelength interval is slightly larger than 1 solar luminosity, or 20 times greater than for the wavelength range 3200-11,000 A. If averaged over intervals of 100 A, it is shown that the UV continuum rises almost monotonically toward shorter wavelengths over the entire interval 1300-3000 A. The UV continuum energy distribution cannot be explained by a T Tauri stellar continuum that is scattered by dust. Emission line identifications and flux measurements strongly confirm the statement that the high-ionization emission lines are too strong to be explained by shock-wave models derived from the emission line spectrum in the interval 3700-11,000 A. A possible explanation for this fact is discussed.

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