The Pleaides is a group of stars in the Southern Hemisphere. They are able to be spotted with the naked eye-you can see 7 of them. That's why they are called the seven sisters. But there are about 80 of them that you cannot see-you need telescopes to see the rest of the Pleaides. They have not shifted from their nebula since birth and they are still inside it, the nebula making them seem to shine blue.
Waiti, Waita, Waipuna a rangi, Tupu a nuku, Tupu a rangi, Te Potiki, Ururangi Also known as the seven sisters or MATARIKI By Tegan Savage
I assume you mean 17 Tauri, one of the stars in the Pleaides cluster. The best information I can find is that it's about six times the radius of the Sun. Despite not being that much larger than the Sun, it's still a "giant" (not on the main sequence). Blue "dwarf" (main sequence) stars are actually not much smaller than the smallest blue "giant" stars, and the difference is determined spectroscopically rather than by size measurements.