Sounds like the asterism known as"The Sickle", which is the head bit of Leo. You've also probably seen Mars (which is reddish) and Saturn (a yellowy colour). Algieba (gamma Leonis) is a red supergiant, Aldhafera (the middle star of the semi circle) is a B class star (blue-white) and the others are red supergiants as well. The brightest one at the top of the sickle's handle is Regulus (alpha Leonis)....B7V spectral class.
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