18. A7

The ratios 4030-4034: 4128-4132 and 4300: 4385 were used to determine the spectral type. The luminosity classes depend on the ratio 4417: 4481.

TABLE 16
STANDARDS AT A7

Star	MKK	a		m	HD
Boo.....	A7 III	14:28	+38°45'	3.0	F0
a Aql.....	A7 V	19:45	+ 8 36	0.9	A5
a Cep.....	A7 V	21:16	+62 10	2.6	A5

Plate 28. Luminosity Effects at A7

High resolution image