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Table 1
Primary temperature-sequence criteria for B-type supergiants.
| Type | Criteria |
|
|
|
| B0 | Si IV λλ4089, 4116 ≫ Si III λ4553 > He II λ4542 |
| B0.2 | Si IV λ4089 > Si III λ4553 ≫ He II λ4542 |
| B0.5 | Si IV λ4089 > Si III λ4553; He II λ4542 absent/marginal |
| B0.7 | Si IV λ4089 ~ Si III λ4553; He II λ4686 absent/marginal |
| B1 | Marginal Si IV λ4116; Si III λ4553 > Si IV λ4089 |
| B1.5 | Weak/marginal Si IV λ4089, weak Mg II λ4481 |
| B2 | Si III λ4553 > Mg II λ4481; Si IV λ4089 absent |
| B2.5 | Si III λ4553 ~ Mg II λ4481; weak Si II λλ4128-32 |
| B3 | Si III λ4553 < Mg II λ4481; Si II λλ4128-32 present |
| B5 | He I λ4471 > Mg II λ4481; Si II λλ4128-32 ~ He I λ4121 |
| B8 | He I λ4471 ~ Mg II λ4481; Si II λλ4128-32 ~ He I λ4144 |
| B9 | He I λ4471 < Mg II λ4481; Si II λλ4128-32 > He I λ4144 |
Notes. Example spectra are shown in Fig. A.1.
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