Astronomy Letters -- June 2000 Volume 26, Issue 6, pp. 339-412 Optical Spectra of Four Objects Identified with Variable Radio Sources V. Chavushyan, R. Mujica, A. G. Gorshkov, V. K. Konnikova, and M. G. Mingaliev pp. 339-343 Full Text: PDF (79 kB) A Self-Similar Solution for Spherically Symmetric Gravitational Collapse R. N. Antonova and Ya. M. Kazhdan pp. 344-355 Full Text: PDF (165 kB) A Self-Similar Solution for a Supernova Explosion with Allowance for Accelerated Relativistic Particles I. N. Toptygin pp. 356-361 Full Text: PDF (71 kB) Super-Alfvén Expansion of a Nova Shell in the Magnetic Field of Its Core S. A. Nikitin, V. A. Vshivkov, and V. N. Snytnikov pp. 362-371 Full Text: PDF (245 kB) A Study of the Shell of Nova V705 Cas V. P. Arkhipova, M. A. Burlak, and V. F. Esipov pp. 372-378 Full Text: PDF (79 kB) Porous Dust Grains in the Shells of Herbig Ae/Be Stars V. B. Il'in and N. A. Krivova pp. 379-389 Full Text: PDF (202 kB) Spectrum of the Star BM Ori at Minimum Light E. A. Vitrichenko and S. I. Plachinda pp. 390-397 Full Text: PDF (97 kB) Optical Spectrum of the Infrared Source IRAS 20004+2955 (V1027 Cyg) V. G. Klochkova, T. V. Mishenina, and V. E. Panchuk pp. 398-403 Full Text: PDF (65 kB) Infrared Photometry for Variable Stars of Selected Types in 1978–1999 O. G. Taranova pp. 404-412 Full Text: PDF (94 kB)