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A yellow star is a "medium" temperature star - a blue star is the hottest.
Red is the coolest star and blue is the hottest.
If you mean "What is the hottest star". The hottest stars are the blue stars. A star appears blue once its surface temperature gets above 10,000 Kelvin, or so, a star will appear blue to our eyes. So the hottest stars in the Universe are going to be a blue star, and we know they're going to be massive.
The hottest star in the constellation Corvis would be 53 G. Crv with a spectral class of A0V giving it a temperature of just below 10,000 degrees K
61 Cygni is a binary star system in the constellation Cygnus.Both stars have a spectral type of K, which means there temperature is around4,500 K. This is cool for a star.See related question for the hottest star.
Cygnus OB2-12 is a very bright blue hypergiant with a temperature of about 18,500K
The hottest area of a star is it's core.
the hottest temperature was 107 degrees
hottest temperature was 50.6 °C
One of the most hottest star is Eta carinae. its surface temperature is 36000-40000 Kelvin. it color is blue.
The hottest star is known as H1504+65 (and also sometimes as WD 1501 +663). The star, in the constellation Ursa Minor, has a surface temperature estimated at 200,000 K. No current model of stellar evolution can explain this tar satisfactorily.By way of comparison, the effective temperature of Rigel is "only" 12,100 K.
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