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".
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.
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.
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.
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.
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.
No, blue stars (type O, >30000 K) are quite a bit hotter than white stars (type A, 7500-10000 K).
A blue-white star (A type star) will have a surface temperatures between 7,600 and 10,000 K
That is a star that either really is faint, or that is far away so that it looks faint.
No, nor is it a record-holder in any other sense.
blue stars are hotter
The blue star is hotter than the red star.
The red star is the coolest and the blue star is the hottest
Yes it is
the blue star has a hotter surface temperature than the red star. (:
The blue star is hotter
blue stars are hotter
Technically Blue stars are hotter but from your options, white stars are hotter.
The blue star is hotter than the red star.
The red star is the coolest and the blue star is the hottest
The blue star is the hottest.
Yes it is
Some stars ARE blue - the hotter ones.
It's not. White is the hottest. Then blue, yellow orange, red.
yes
yes
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.