5. B1
The blend at 4640-4650 is fairly uniform in intensity; the red edge may still be slightly stronger, however. Si III 4552 is stronger than Si IV 4089, and the broad blend near 4070-4076 is well marked. The line ratios used for luminosity classification are 3995: 4009, 4121: 4144, 4144: 4416, and 4387: 4416. The Si III lines and the wings of the H lines are also sensitive to luminosity differences.
Star | MKK | a | m | HD | |
o Per..... | B1 IV | 03:38 | +31° 58' | 3.9 | B1 |
Per..... | B1 I | 03:47 | +31 35 | 2.9 | B1 |
Ori..... | B1 V | 05:19 | -02 29 | 3.4 | B1 |
CMa.... | B1 II-III | 06:18 | -17 54 | 2.0 | B1 |
CMa.... | B1 II | 06:54 | -28 50 | 1.6 | B1 |
Leo..... | B1 I | 10:27 | +09 49 | 3.9 | B0p |
a Vir..... | B1 III-IV | 13:19 | -10 38 | 1.2 | B2 |
Sco.... | B1 III | 16:15 | -25 21 | 3.1 | B1 |
Cep.... | B1 IV | 21:27 | +70 07 | 3.3 | B1 |
High resolution image |