Plate 17: Five B7 III–B9 III Stars

Star Index

Plate 17: Five B7 III–B9 III Stars

These five spectra have one unusual thing in common: the presence of diffuse, shallow He I lines, together with a much narrower stellar Ca II K–line. In some other respects, the spectra differ: in 20 Tau the Fe II lines are abnormally strong; in α ScI C II 4267 is too strong for its type; in μ Lep and NGC 2516–B the lines of Mn II and Hg II are outstanding. The narrow K lines do not appear to have a sensible interstellar contribution. Scale of original spectrograms is 39 A/mm.

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