STELLAR CHEMICAL ABUNDANCES WITH THE GHRS

The accurate quantitative analysis of high resolution ultraviolet spec tra of ultra-sharp-lined early-type, chemically peculiar stars, obtain ed with the Goddard High Resolution spectrograph on the Hubble Space T elescope, has been made possible by the synergism between state-of-the -art astro-physics and state-of-the-art atomic spectroscopy. We illust rate this with several examples, including the discovery of spin-forbi dden ''parasite'' transitions of Fe II, the first observations of hype rfine components and isotopic shifts of stellar lines of thallium, and measurements of the photospheric abundances of a large number of norm ally trace elements.