ORFEUS II Echelle spectra: Molecular hydrogen at high velocities toward HD 93521

W. Gringel, J. Barnstedt, K. S. de Boer +3

Absorption lines of interstellar molecular hydrogen in the far ultraviolet (FUV) have been observed in the spectrum of the O9.5 halo star HD 93521, located some 1500 pc from the Ga…