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It's kind of the other way around: they're blue because they're hotter, not hotter because they're blue. Blue light is more energetic than red light, so it requires a higher temperature to produce. If you'd like to know more details of exactly how this works, look up the term "black body radiation" or "cavity radiation".

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14y ago
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13y ago

A blue giant star is a star with a spectral type of O or B, and therefore will appear blue. It has a luminosity class of III. It is when the star has used up the fuel in its core and exited main sequence. As a blue giant cools, it becomes a red giant star.

Blue giants are extremely luminous, reaching magnitudes of -5, -6 and even higher. Their surface temperature is high enough that a sizable fraction of their energy output is in the ultraviolet range, thus invisible to our eyes.

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15y ago

Almost any star can be a white star.

If you mean a white dwarf, a white dwarf is a collapsed star/sun, making it a small size with great mass. They glow from stored heat, not from hydrogen fusion like ordinary stars.

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14y ago

That is a star that either really is faint, or that is far away so that it looks faint.

That is a star that either really is faint, or that is far away so that it looks faint.

That is a star that either really is faint, or that is far away so that it looks faint.

That is a star that either really is faint, or that is far away so that it looks faint.

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12y ago

A bluish white star is a star that is very young and very hot (younger and hotter than our sun, at least). They usually have a very high magnitude (brightness) and die sooner than most stars because they consume their fuel too quickly. Blue stars are the hottest/brightest stars, followed by white stars, and then yellow, yellow-orange, red-orange, and red. To give you an idea of a bluish white star, look up the star Deneb which is the brightest star in the constellation Cygnus the Swan.

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14y ago

The apparent brightness of a star is measured by its apparent magnitude [See Link], which is the brightness of a star with respect to the star's luminosity, distance from Earth, and the altering of the star's light as it passes through Earth's atmosphere.

Therefore the brightest Stars from Earth are, the Sun (Class G), then Sirius (Class A) and then Canopus (Class F).

In Stellar Classification [See Link] an informal tradition places, O stars as "blue", A stars "white", G stars "yellow" and M stars "red". Referring to the Harvard Spectral Classification shows O stars (Blue) as having a luminosity of > 30,000. B stars (Blueish white) luminosity 25 -> 30,000 and A stars (White) having a luminosity of 5 --> 25.

The most luminous stars are Blue.

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14y ago

No, blue stars (type O, >30000 K) are quite a bit hotter than white stars (type A, 7500-10000 K).

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12y ago

A blue-white star (A type star) will have a surface temperatures between 7,600 and 10,000 K

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14y ago

That is a star that either really is faint, or that is far away so that it looks faint.

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12y ago

No, nor is it a record-holder in any other sense.

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If a blue star wasn't so hot - it wouldn't be a blue star - it would be a white star.See related question for more details.