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5.5. The K-System

This is the most numerous group of all and comprises 23 galaxies having a great diversity in appearance. Their spectra, however, indicate that the principal contribution to the total luminosity in the blue-violet region is probably from K-type giant stars. The K-systems are listed in Table V, and they all have one property in common: the major part of the luminosity originates in a brilliant, amorphous central region.


NGC Hubble NGC Hubble NGC Hubble

224 (M 31) Sb 4111 S0 4649 (M 60) E2
1398 SBb 4216 Sb 4699 Sb
2841 Sb 4260 SBa 4762 Sa
2950 SB0 4486 (M 87) E0 5308 S0
3031 (M 81) Sb 4565 Sb 5363 Irr
3115 E7 4594 Sb 5473 SB0
3990 S0 4636 E0 5850 SBb
3998 S0 4643 SB0

The forms of the K-systems fall into several well-defined groups: (1) the great Sb and Sa spiral systems; (2) barred spirals of strong central concentration of light; (3) the giant elliptical systems; (4) "dustless" systems similar in figure to the Sa-Sb spirals; (5) nondescript systems.