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27. G0

The spectral type is determined from the ratios lambda 4045: Hdelta and lambda 4226: Hgamma. Luminosity differences are well shown by the ratios lambda 4077: lambda 4226, and lambda 4077: lambda 4045 and for the high-luminosity stars by lambda 4077: Hdelta.

TABLE 22
STANDARDS AT G0

Star MKK a delta m HD Notes

eta Cas A.. G0 V 00:43 +57°17' 3.6 F8
delta Tri........ G0 V 02:10 +33 46 5.1 G0
iota Per........ G0 V 03:01 +49 14 4.2 G0
chi1 Ori..... G0 V 05:48 +20 15 4.6 F8
epsilon Hya...... G0 III 08:41 +06 47 3.5 F8 1
47 UMa... G0 V 10:53 +40 58 5.1 G0
xi UMa.... G0 V 11:12 +32 06 3.9 G0 2
beta CVn.... G0 V 12:29 +41 54 4.3 G0
beta Com.... G0 V 13:07 +28 23 4.3 G0
eta Boo...... G0 IV 13:49 +18 54 2.8 G0
zeta Her...... G0 IV 16:37 +31 47 3.0 G0

NOTES
1. The absorption extending toward the violet from lambda 4215 is faintly present.
2. Integrated light of system.

Plate 39. The Cepheid Variable X Cygni
Plate 39
High resolution image

Plate 40. Luminosity Effects at G0
Plate 40
High resolution image

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