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20. F2

The ratio of intensity lambdalambda 4030-4034: lambdalambda 4128-4132 is greater than in the corresponding luminosity class at F0. A shading is observed degrading toward the red from lambda 4300. The luminosity class is determined from the ratios lambda 4171: lambda 4226 and lambda 4077: lambda 4045.

TABLE 18
STANDARDS AT F2

Star MKK a delta m HD

beta Cas..... F2 III 00:03 +58°36' 2.4 F5
delta Gem..... F2 IV 07:14 +22 10 3.5 F0
upsilon UMa..... F2 III 09:43 +59 31 3.9 F0
78 UMa... F2 V 12:56 +56 54 4.9 F0
sigma Boo...... F2 V 14:30 +30 11 4.5 F0
zeta Ser....... F2 IV 17:55 -03 41 4.6 F0
pi Sgr...... F2 II 19:03 -21 11 3.0 F2

Plate 30. Supergiants F0 - K5
Plate 30
High resolution image

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