What type of star is beta?
A beta star is generally, but not always, the second brightest star within a constellation.
Algol (Demon Star) is a bright star in the constellation Perseus. Algol is actually a triple star system - Beta Persei A, B, and C Beta Persei A has a spectral type of B8 and is a blue-white giant Beta Persei B has a spectral type of K0 and is an orange subgiant See related link for more information.
Graffias refers to two binary stars in the constellation Scorpius.It was considered a double star -comprising Beta 1 Sco and Beta 2 Sco, orbiting each other. Beta 1 itself is a double star with a companion. Beta 2 has a dim companion. Thus, Graffias is a bluish white 5-star system. The brightest or the lead star from Beta 1 is so bright it will need 20,000 Suns to match it. (Source: Jim Kaler)