Next Contents Previous

31. K0

Spectral type is determined from the ratios lambdalambda 4030-4034: lambda 4300, lambda 4290: lambda 4300, and Hdelta: lambda 4096. Luminosity differences are shown by the ratios lambda 4063: lambda 4077, lambda 4071: lambda 4077, lambda 4144: lambda 4077, and by the intensity difference of the continuous spectrum on each side of lambda 4215.

TABLE 26
STANDARDS AT K0 AND K1

Star MKK a delta m HD Notes

54 Psc .... K0 V 00:34 +20°43' 6.1 K0
a Cas ..... K0 II-III 00:34 +55 59 2.3 K0
delta Eri ....... K0 IV 03:38 -10 06 3.7 K0 1
delta Aur ...... K0 III 05:51 +54 17 3.9 K0
beta Gem ..... K0 III 07:39 +28 16 1.2 K0
zeta Hya ..... K0 III 08:50 +06 20 3.3 K0
lambda Hya ..... K0 III 10:05 -11 52 3.8 K0
gamma Leo A ... K0 pec 10:14 +20 21 2.6 K0 2
46 LMi .... K0 III-IV 10:47 +34 45 3.9 K0
nu Oph ..... K0 III 17:53 -09 46 3.5 K0
70 Oph A. K0 V 18:00 +02 31 4.3 K0
eta Ser ..... K0 III-IV 18:16 -02 55 3.4 K0
sigma Dra ..... K0 V 19:32 +69 29 4.8 K0
eta Cyg ..... K0 III 19:52 +34 49 4.0 K0
52 Cyg .... K0 III 20:41 +30 21 4.3 K0
epsilon Cyg ..... K0 III 20:42 +33 36 2.6 K0
eta Cep ..... K0 IV 20:43 +61 27 3.6 K0
iota Cep ..... K0 III 22:46 +65 40 3.7 K0
107 Psc ... K1 V 01:37 +19 47 5.3 G5
theta Her ..... K1 II 17:52 +37 16 4.0 K0
gamma Cep ..... K1 IV 23:35 +77 4 3.4 K0

NOTES
1. The spectrum indicates a lower luminosity than eta Cep.
2. Luminosity criteria are conflicting. From the ratio lambda 4063: lambda 4077 gamma Leo A would be judged more luminous than beta Gem (class III), while the intensity of the CN break at lambda 4215 is less than in stars of class III. The double star gammaLeo is a high-velocity system, and the spectral peculiarities are similar to those of the high-velocity stars a Boo and delta Lep.

Plate 46. Luminosity Effects at K0
Plate 46
High resolution image

Plate 47. High Luminosity Stars at K1
Plate 47
High resolution image

Next Contents Previous