Blue stars have the hottest surface temperatures. They also have a strong ultra violet continuum. An example of this type of star is the 10 Lacertra.
White stars have lower surface temperatures compared with blue stars. They are also typically smaller compared with blues. Canopus and Procyon are two stars in the blue to white and white to yellow classifications.
Yellow stars have a temperature within the range of 6,000 to 5,000 K and typically come in a range that combines yellow or blue.
Orange stars have less heat than the other groups of stars -- somewhere in the range between 3,500 and 5,000 K. They're also smaller than the other categories of warmer stars.
Red stars are the coolest type of star with a surface temperature of less than 3,500 K. Reds are also the smallest of the star groups.
The hotter the star, the greater luminosity. That means we see hotter stars better and clearer than the fainter, cooler stars.
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