A5

Betelgeuse

M2ev I

first decimal figure is based upon temperature in a similar manner to the variation in the core classes. The second figure indicates the degree of intensity of the defining peculiarities. This last classification is highly complex and details are left for the reader to find in specialist literature. As examples of these classes we have

Pictorially, we may represent the main classes currently in use today as shown in figure 11.6.

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