I took spectra of the 3 bright stars in Orions belt a couple of nights ago. This is for a project called
The Orion Project but I thought I would show them here as well. The 3 stars are delta Ori, Eps Ori and Zeta Ori.
All are hot O stars so show similar spectra. As they are very hot they are very bright in the blue.
They have faint Hydrogen absorption lines plus He lines.
Terry