Andre Crusius-Watzel , Visiting Scientist, University of Bonn. 

 "Radiative Transfer in Relativistic Plasma," with James 

 Moran, from August 15, 1989 to September 30, 1990. 



Ilya Fabrikant, visiting Scientist, Latvian State University. 

 "Low-Energy Electron Scattering by Highly Polarizable 

 Targets and Photodetachment of Negative Ions in the 

 Presence of External Fields," with Alexander Dalgarno, from 

 April 1 to July 31, 1989. 



Daniel Gomez, Postdoctoral Fellow, Universidad de Buenos Aires. 

 "Dynamical Processes in the Solar Corona," with Petrus 

 Martens, from September 1, 1989 to August 31, 1990. 



Xiaofeng Han, Predoctoral Fellow, Harbin Institute of Technology. 

 "Measurements and Analysis of Unknown Atomic and Molecular 

 Data," with Irwin Shapiro, from October 1, 1989 to 

 September 30, 1990. 



Andreas Heithausen, Visiting Scientist, University of Bonn. 

 "Galactic Cirrus Clouds: A New Class of Interstellar 

 Clouds?," with Patrick Thaddeus, from February 1 to 

 September 30, 1989. 



William Hoffmann, Visiting Scientist. "Interpretation of 



Spectral Line Data: A Probe of the Physical Conditions in 

 Circumstellar Material and Star Forming Regions," with 

 Giovanni Fazio, from February 1 to June 15, 1989. 



Pawan Kumar, visiting Scientist, California Institute of 

 Technology. "The Detection of Stellar and Solar 

 Oscillations," with Robert Noyes, from October 1, 1988 to 

 March 11, 1989. 



Juan Muzzio, Senior Postdoctoral Fellow, La Plata University. 

 "The Disintegration of Satellite Galaxies," with Myron 

 Lecar, from January 1 to March 31, 1989. 



Birgitta Nordstrom, Visiting Scientist, Copenhagen University 

 Observatory. "Investigations of the Structure of the 

 Galactic Disk," with David Latham, from December 1, 1988 to 

 June 30, 1989. 



Marco Romoli, Visiting Scientist, University of Firenze. "The 

 Development of Instrumentation for the Smithsonian 

 Astrophysical Observatory's UVCS/Sotto Project," with John 

 Kohl, from April 3, 1989 to October 2, 1990. 



Shen Wei, Visiting Scientist, Shaanxi Astronomical Observatory. 

 "Hydrogen Maser Frequency Standards," with Robert Vessot, 

 from January 1 to September 30, 1989. 



Andrzej Soltan, Visiting Scientist, Warsaw University. "An 

 Investigation of X-ray Properties of Extra-Galactic 

 Objects," with Harvey Tananbaum, from July 1 to November 

 14, 1989. 



59 



