The ORFEUS II Echelle spectrum of HD 93521: A reference for interstellar molecular hydrogen

During the second flight of the ORFEUS-SPAS mission in November/December 1996, the Echelle spec- trometer was used extensively by the Principal and Guest Investigator teams as one of the two focal plane in- struments of the ORFEUS telescope. The spectrum of HD 93521 was obtained during this mission with a total integration time of 1740 s. This spectrum shows numer- ous sharp interstellar absorption lines. We identied 198 lines of molecular hydrogen including at least 7 lines with a high velocity component. Also most of the 67 identi- ed interstellar metal lines are visible with a high velocity component. We present plots of the complete ORFEUS II Echelle spectrum together with tables of all identied interstel- lar absorption lines including all 14 detectable H I lines. In addition several identied stellar lines, partially with narrow absorption components, and stellar wind lines are given in a separate table.