2. O9.5
At class O9.5 the line at 4200 is intermediate in intensity between O9 and B0. He I 4541 is weaker than in class O9.
High resolution image |
Star | MKK | a | m | HD | Notes | |
9 Cam... | O9.5 I | 04:44 | +66° 10' | 4.4 | B0 | |
Ori.... | O9.5 III | 05:26 | -00 22 | 2.5 | B0 | |
Ori.... | O9.5 V | 05:33 | -02 39 | 3.8 | B0 | |
Ori.... | O9.5 III | 05:35 | -02 00 | 2.1 | B0 | |
Oph... | O9.5 V | 16:31 | -10 22 | 2.7 | B0 | 1 |
19 Cep.. | O9.5 I | 22:02 | +61 48 | 5.2 | Oe5 | |
NOTES | ||||||
1. The He I lines are exceedingly broad - considerably broader than in such Bnn stars as UMa and Gas. The lines are intermediate in width between UMa and Per. The interstellar K line appears to be abnormally strong for the spectroscopic luminosity. The line He II 4686 is strong on low-dispersion plates taken especially to minimize the effect of the broad lines. The spectroscopic luminosity is similar to that of Ori. |
The absolute-magnitude differences are shown by the ratios 4068: 4089, 4119: 4144, 4387: 4516, and 4650: 4686.
High resolution image |
High resolution image |