Astronomy Letters -- February 2001 Volume 27, Issue 2, pp. 65-133 Nuclear Activity of NGC 4151 as Inferred from UBVRI Observations in 1989–2000 V. T. Doroshenko, V. M. Lyuty, N. G. Bochkarev, V. V. Vlasyuk, V. P. Mikhailov, O. I. Spiridonova, K. N. Grankin, O. V. Ezhkova, and S. Yu. Mel'nikov pp. 65-73 Full Text: PDF (184 kB) A Photometric Study of the Polar Ring Galaxy UGC 5600 G. M. Karataeva, V. A. Yakovleva, V. A. Hagen-Thorn, and O. V. Mikolaichuk pp. 74-80 Full Text: PDF (475 kB) Supersonic Steady Accretion of a Rotating Cold "Iron Gas" onto a Neutron Star after Gravitational Collapse V. S. Imshennik and M. S. Popov pp. 81-90 Full Text: PDF (124 kB) Oscillatory Propagation of an Ionization–Shock Front K. V. Krasnobaev pp. 91-94 Full Text: PDF (66 kB) Infrared Speckle Interferometry of Eleven Binaries Using a Bispectral Analysis I. I. Balega, Yu. Yu. Balega, K.- H. Hofmann, and G. Weigelt pp. 95-98 Full Text: PDF (77 kB) Line Identification and Photometric Observations of the Future Planetary Nebula IRAS 18 062+2410 = V886 Her in 1997–1999 V. P. Arkhipova, V. G. Klochkova, and G. V. Sokol pp. 99-107 Full Text: PDF (199 kB) Absolute Magnitudes and Kinematic Parameters of the Subsystem of RR Lyrae Variables A. K. Dambis and A. S. Rastorguev pp. 108-117 Full Text: PDF (166 kB) Oscillations of Flux Tube Bundles and the Structure of Sunspot Magnetic Fields E. Yu. Nagovitsyna and Yu. A. Nagovitsyn pp. 118-123 Full Text: PDF (68 kB) On the Motion of a Mass Point Inside a Rotating Inhomogeneous Ellipsoidal Body S. A. Gasanov pp. 124-133 Full Text: PDF (119 kB)