Affiliation: | FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea;Department of Astronomy, University of Massachusetts, Amherst, MA 01002, USA;Astronomische Rechen-Institut, Zentr. Astron. Univ. Heidelberg (ZAH), Monchhofstrasse 12-14, 69120 Heidelberg, Germany |