Sulphur I emission lines in the EUV spectrum of β GRU (M3 II)
The excitation mechanisms producing the strong S I lines observed in the EUV spectra of late-type giants are discussed. For the case of 8 Gru it is shown that the broad H Ly-e line plays an important role in producing the observed multiplets.
KeywordsOscillator Strength Column Density Line Flux Atomic Data Excitation Mechanism
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