Anyone know the diameter of the star Thuban found in the Draco constellation and it's color?

Help plz!Anyone know the diameter of the star Thuban found in the Draco constellation and it's color?Thuban is 7.0 times the diameter of the Sun, and is spectral class B, making it blue in colour.Anyone know the diameter of the star Thuban found in the Draco constellation and it's color?Thuban is spectral class A0III, giving it the same color as Vega (slightly bluish white), but much larger, as Vega is a very young star, while Thuban has started to move onto the giant branch. Its diameter is about 18 million miles. It has a companion star, a red dwarf, in a 51 day orbit. No planets have been found there.