9. B8

The spectral type is determined principally from the ratio of Si II 4128-4130 to He I 4144. The luminosity class is determined from the appearance of the wings of the hydrogen lines.

TABLE 9
STANDARDS AT B8

Star	MKK	a		m	HD
Per......	B8 V	3:01	+40°34'	2.2	B8
Tau......	B8 III	3:41	+23 48	3.0	B5p
Ori......	B8 Ia	5:09	- 8 19	0.3	B8p
Tau......	B8 III	5:20	+28 31	1.8	B8
CMi.....	B8 V	7:21	+ 8 29	3.1	B8
a Leo......	B8 V	10:03	+12 27	1.3	B8
Lib.......	B8 V	15:11	- 9 1	2.7	B8

Plate 17. Luminosity Effects at B8

High resolution image

Plate 18. The Peculiar Stars Beta Lyr and Nu Sgr

High resolution image