Astronomy Letters -- May 2001 Volume 27, Issue 5, pp. 277-344 First Observations with the 64-m Kalyazin Telescope Included in a Ground-Based–Space Interferometer: The Quasar 3C 147 V. I. Slysh, M. V. Popov, B. Z. Kanevskii, A. I. Smirnov, A. V. Kovalenko, Yu. P. Ilyasov, V. V. Oreshko, B. A. Poperechenko, H. Hirabayashi, K. M. Shibata, and E. B. Fomalont pp. 277-283 Full Text: PDF (95 kB) Optical Studies of Extragalactic Infrared Sources S. K. Balaian, S. A. Akopian, A. M. Mikaelian, and A. N. Burenkov pp. 284-291 Full Text: PDF (105 kB) Cosmic-Ray Energetics in the Supernova Remnant Cassiopeia A K. S. Stankevich and V. P. Ivanov pp. 292-296 Full Text: PDF (73 kB) The X-ray Source SLX 1732–304 in the Globular Cluster Terzan 1: The Spectral States and an X-ray Burst M. N. Pavlinsky, S. A. Grebenev, A. A. Lutovinov, R. A. Sunyaev, and A. V. Finoguenov pp. 297-303 Full Text: PDF (120 kB) General-Relativistic Curvature of Pulsar Vortex Structure A. A. Shatskii pp. 304-312 Full Text: PDF (224 kB) Analysis of HST and IUE Ultraviolet Spectra for T Tauri Stars: DF Tau S. A. Lamzin, A. A. Vittone, and L. Errico pp. 313-323 Full Text: PDF (193 kB) Infrared Observations of the Star R Cas A. É. Nadzhip, A. M. Tatarnikov, V. I. Shenavrin, G. Weigelt, and B. F. Yudin pp. 324-327 Full Text: PDF (73 kB) A Spectroscopic Study of the Secondary Star of BM Ori: Preliminary Results É. A. Vitrichenko and V. G. Klochkova pp. 328-337 Full Text: PDF (111 kB) Infrared Photometry of Five Long-Period Binaries O. G. Taranova and V. I. Shenavrin pp. 338-344 Full Text: PDF (131 kB)