Answer: bstar

AnswerCrossword Clue
BSTARRigel, for one
BSTARMassive, relatively hot luminous body
BSTARRigel or Spica
BSTARConstellation component
BSTARBlue spectral type.
BSTARSpectral type, in astrophysics.
BSTARSpectral body
BSTARSpectral type
BSTARIt's massive and relatively hot
BSTARBright sky sight