N any of various groups into which stars are classified according to characteristic spectral lines and bands. The most important classification (Harvard classification) has a series of classes O, B, A, F, G, K, M, the series also being a scale of diminishing surface temperature 光谱型
The properties of distribution class and spectral class for a self-similar set are studied.
给出了分布类中的分布集与谱类的子集之间的关系。
A relation between distribution sets in the distribution class and the subsets in a spectral class is given.
给出了分布类中的分布集与谱类的子集之间的关系。
A complete MK designation includes both spectral type and luminosity class -for instance, the sun is a G2V.
一个完整的MK系统代号包含光谱类型和光度型两部分——例如，太阳属于G 2 V类恒星。
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