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33. K3

The spectral type is determined from the ratios lambda 4226: lambda 4325 and lambda 4290: lambda 4299. Luminosity classes are determined from the ratios lambda 4071: lambda 4077, lambda 4063: lambda 4077, lambda 4045: lambda 4077, lambda 4260: lambda 4215 and lambda 4325: lambda 4340.

TABLE 28
STANDARDS AT K3

Star MKK a delta m HD

delta And ..... K3 III-IV 00:34 +30°19' 3.5 K2
iota Aur ..... K3 II 04:50 +33 00 2.9 K2
a Hya ..... K3 III 09:22 -08 14 2.2 K2
rho Boo ..... K3 III 14:27 +30 49 3.8 K0
epsilon CrB ..... K3 III 15:53 +27 10 4.2 K0
pi Her ..... K3 II 17:11 +36 55 3.4 K5
lambda Her ..... K3 III 17:26 +26 11 4.5 K0
a Sct ..... K3 III 18:29 -08 19 4.1 K0
1 Lac ..... K3 III 22.11 +37 15 4.2 K0
S 7259 .... K3 V 23:08 +56 37 5.7 K2

The mean absolute magnitude of the stars of luminosity class III is probably higher than at type K0. No subgiants were observed at K3.

Plate 48. Luminosity Effects at K3
Plate 48
High resolution image

Plate 49. High Luminosity Stars at K3
Plate 49
High resolution image

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