Which of the following letters representing spectral classification signifies the hottest stellar surface temp

Question

G, A, K or B

Answer 1

The Answer is B.

Ordered from highest temperature to lowest, the seven main stellar types are O, B, A, F, G, K, and M. Astronomers use one of several mnemonics to remember the order of the classification scheme. O, B, and A type stars are often referred to as early spectral types, while cool stars (G, K, and M) are known as late type stars. The nomenclature is rooted in long-obsolete ideas about stellar evolution, but the terminology remains. The spectral characteristics of these types are summarized below:


O Blue > 25,000 K Singly ionized helium lines either in emission or absorption. Strong ultraviolet continuum. 10 Lacertra

B Blue 11,000 - 25,000 Neutral helium lines in absorption. Rigel,
Spica

A Blue 7,500 - 11,000 Hydrogen lines at maximum strength for A0 stars, decreasing thereafter. Sirius, Vega

F Blue to White 6,000 - 7,500 Metallic lines become noticeable. Canopus, Procyon

G White to Yellow 5,000 - 6,000 Solar-type spectra. Absorption lines of neutral metallic atoms and ions (e.g. once-ionized calcium) grow in strength. Sun, Capella

K Orange to Red 3,500 - 5,000 Metallic lines dominate. Weak blue continuum. Arcturus, Aldebaran

M Red < 3,500 Molecular bands of titanium oxide noticeable. Betelgeuse, Antares

Not to be confused with M Class main sequence classification. See HERTZSPRUNG RUSSEL DIAGRAM for more detail.

Jules, Australia.

Answer 2

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Answer 3

Of those, "B".

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