Table 1
Grid of primary classification standards that are kept after the revision process and retain their classification – if intermediate types are not interpolated.
| V | IV | III | Iab | Ia | ||
|---|---|---|---|---|---|---|
| B0 | τ Sco | ϵ Ori | ||||
| B0.5 | κ Ori | |||||
| B1 | ω1 Sco | ζ Per | ||||
| B2 | β2 Sco* | γ Peg, ζ Cas | γ Ori | 9 Cep | χ2 Ori | |
| B2.5 | σ Sgr | |||||
| B3 | 29 Per, η UMa, η Aur | ι Her | o2 CMa | |||
| B5 | ρ Aur* | 67 Oph* | η CMa | |||
| B6 | 19 Tau | |||||
| B7 | HD 21071* | β Tau | ||||
| B8 | 18 Tau | 27 Tau* | β Ori | |||
| B9 | α Del |
Notes. The anchor standards of Garrison (1994) are shown in bold. Standards marked with an asterisk present complications which are discussed in the respective subsections.
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