Observations of 3C 273 with the Goddard High Resolution Spectrograph on the Hubble Space Telescope .2.

Observations of the quasar 3C 273 taken with the Goddard High Resolution Spectrograph in 1993 November and December are presented here. We have included both the fully-reduced spectra, and spectra combined with our earlier (1991) observations. There are a total of IO new medium resolution exposures covering four wavelength regions: 1164-1201 Angstrom, 1214-1251 Angstrom, 1537-1573 Angstrom, and 1633-1670 Angstrom. We confirm the suggestion of Morris et al. (1991, ApJ, 377, L21) that the galactic Si IV lambda 1393 line is blended with an extragalactic Ly alpha line by observing the Ly beta counterpart to this extragalactic line. We obtain an improved upper limit on the C IV/H I ratio in these weak low redshift Ly alpha absorption systems by coadding the corresponding C IV spectral regions. Improved line profiles for the galactic C IV and N V absorption are also presented and discussed. The improved measurements lead to a downward revision of the galactic C IV column density, log N(C IV) = 14.46+/-0.04. (C) 1997 American Astronomical Society.