In the Morgan-Keenan spectral system, which letter denotes the hottest stars?

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Prepare for the NES Earth and Space Science (307) Test. Use flashcards and multiple-choice questions with explanations to enhance your understanding and boost your confidence. Excel in your exam preparation!

Multiple Choice

In the Morgan-Keenan spectral system, which letter denotes the hottest stars?

Explanation:
The hottest stars are classified as O-type in this system. The sequence from hottest to coolest follows O, B, A, F, G, K, M. O-type stars are blue-white and have surface temperatures around 30,000 kelvin or hotter, with spectral features (like strong ionized helium lines) that reflect their extreme heat. As you move to cooler classes, the stars appear redder and their spectral lines change accordingly. So the choice that identifies the hottest stars is the one that names O-type.

The hottest stars are classified as O-type in this system. The sequence from hottest to coolest follows O, B, A, F, G, K, M. O-type stars are blue-white and have surface temperatures around 30,000 kelvin or hotter, with spectral features (like strong ionized helium lines) that reflect their extreme heat. As you move to cooler classes, the stars appear redder and their spectral lines change accordingly. So the choice that identifies the hottest stars is the one that names O-type.

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