Morgan-Keenan

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1.

Stars are typically classified by their spectrum in what is known as the Morgan -Keenan or MK system .

恒星根据它们的光谱被分为典型的几类，这就是摩根 -基南（Morgan-Keenan ）分类法，即 MK 系统。

2.

Stars are also classified by their luminosity under the Morgan-Keenan system .

恒星在 MK 系统下，也经常根据光度分类。