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Fig. 1


Spectra of He-normal stars for which hydrogen is dominant and either helium lines of both ionization states or metallic lines are visible. The lines marked are H + HeII λλ 4101, 4340, 4861; HeII λλ 4200, 4541, 4686; NV λ 4604–20; OIV λ 4632; CIV λ 4658 blend; SiIII λ 4552–68; HeI λλ 4144, 4387, 4471, 4713; SiII λ 4128–30; MgII λ 4481; and λλ 4360, 4369, 4772 emission.

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