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VEGA
A good example of a white star is Sirius, Deneb, Altair or Vega.
They are both very bright, particularly Altair. Altair is also part of what is known as the summer triangle, along with Deneb in the constellation Cygnus and Vega in the constellation Lyra.
Altair in the constellation of Aquila the Eagle, Vega in the constellation of Lyra the Harp and Deneb in the constellation of Cygnus.
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Vega and Altair are stars not constellations.
Aldeberan, Vega, Rigel, Betelgeuse, Altair, Arcturus, Sirius, Procyon, Capella, Spica, Antares, Deneb, Regulus, and the Sun are.
Since you neglected to name two of them in the question, I'll have to list all three in order to be sure of answering it: -- Vega . . . in Lyra -- Altair . . . in Aquila -- Deneb . . . in Cygnus
It is a reference to three bright stars that can be seen in northern hemisphere. Altair in the constellation Aquila, forms the top of the triangle. Vega in the constellation Lyra is the brightest star and is almost directly overhead. Deneb in the constellation Cygnus is the third star.
Deneb Algedi
This is the order from smallest stars to the biggest stars: Alpha Centauri, Procyon, Vega, Pollux, Polaris, and Deneb. These are the size(diameter) of them; though the size of the stars are not 100% accurate so they are likely to be predicted. Alpha Centauri is 1,527,000 Procyon is 2,652,000 Vega is 3,827,000 Pollux is 11,617,000 Polaris is 44,217,000 and Deneb is 203,000,000
Vega