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Table 2
Primary temperature-sequence criteria for B-type dwarfs.
| Type | Criteria |
|
|
|
| B0 | Si IV λ4089 > Si III λ4553> He II λ4542 |
| B0.2 | Si IV λ4089 > Si III λ4553; He II λ4542 marginal |
| B0.5 | He II λ4542 absent; Si III λ4116 marginal/absent |
| B0.7 | He II λ4686 marginal/absent; Si III λ4116 marginal/absent |
| B1 | Si III λ4553 > Si IV λ4089; Si IV λ4116, He II λ4686 absent |
| B1.5 | Si IV λ4089 absent; Si III λ4553 ~ Mg II λ4481 |
| B2 | Si III λ4553 < Mg II λ4481 |
| B2.5 | Si III λ4553 absent; Si II λλ4128-32 marginal |
Notes. Example spectra are shown in Fig. A.3.
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