Abstract
Emission in the Lyman bands of H2 has been detected in an extreme ultraviolet (EUV) spectrum of T Tauri and its adjacent nebula, obtained with the international UV explorer (IUE) satellite. We report here that the emission is in a progression which can be excited through fluorescence with the red wing of the H Lyα line, as found also in the solar atmosphere1. The observed EUV fluxes, absence of other progressions and the flux in the previously observed2 1–0 S(1) IR line support a model where collisional rather than radiative excitation leads to an excitation temperature of ≳ 2,000 K.
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Brown, A., Jordan, C., Millar, T. et al. H2 emission in the EUV spectrum of T Tauri and Burnham's nebula. Nature 290, 34–36 (1981). https://doi.org/10.1038/290034a0
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DOI: https://doi.org/10.1038/290034a0
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