Plate 11: Luminosity Effects at B2

Star Index

Plate 11: Luminosity Effects at B2

The diffuse singlet and triplet lines of He I marked, together with the Balmer series of H, strengthen toward decreasing luminosity. δ Ori (ft) shows these He I luminosity effects to an extreme degree; at the same time, He I 4121 and C II 4267 are markedly narrower than the diffuse He I lines; this total appearance is denoted by the suffix h. Extremely broad–lined spectra have been excluded from these B2 standards; they will be illustrated on a separate plate.

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