Re: Question
The stars in a constellation are typically described by Greek letters in order of brightness and also some other criteria (see: Bayer designations). Alpha Centauri, for example, is the brightest star in Centaurus.
T Pyxidis, which (I suppose) is "Tau," appears to be a very dim star in its constellation.
Some stars have more than one name. Betelgeuse, for example, is also Alpha Orionis.