Synthetic line profiles of C iii– iv, N iii– v, Si iii– iv, P iv– v, S iv– v, and Ge iv– v calculated from models with 57 000 K ≤ Teff ≤ 62 000 K and log g = 7.6 compared with FUSE and STIS observations. The small horizontal bars, labeled with the element’s name, indicate Teff where the ionization balance is best reproduced. The lines are identified at the top. “is” denotes interstellar origin. In the cases of C iv λλ 1548,1550 Å, C iv λλ 1548,1550 Å, and Si iii λλ 1206.500,1206.555 Å, the photospheric line profile is shown by a dashed, blue line (for the model at the top only).
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