Astronomy Letters -- April 2000 Volume 26, Issue 4, pp. 199-267 Observations of the Gamma-Ray Flux from the Galaxy Mk 501 N. A. Andreeva, Yu. L. Zyskin, O. R. Kalekin, Yu. I. Neshpor, A. A. Stepanyan, V. P. Fomin, N. N. Chalenko, and V. G. Shitov pp. 199-203 Full Text: PDF (91 kB) Observations of Extragalactic Radio Sources at 36 GHz N. S. Nesterov, A. E. Volvach, and I. D. Strepka pp. 204-207 Full Text: PDF (87 kB) On the Internal Structure of Relativistic Jets V. S. Beskin and L. M. Malyshkin pp. 208-218 Full Text: PDF (129 kB) Photometric Deprojection of Edge-on Galaxies D. V. Bizyaev pp. 219-224 Full Text: PDF (66 kB) Analysis of HST Ultraviolet Spectra for T Tauri Stars: RU Lup S. A. Lamzin pp. 225-232 Full Text: PDF (152 kB) A Photometric and Spectroscopic Study of the Herbig Ae/Be Star XY Per S. Yu. Melnikov and O. V. Ezhkova pp. 233-243 Full Text: PDF (499 kB) Continuum Spectrum of the Star Theta1 Ori C E. A. Vitrichenko pp. 244-249 Full Text: PDF (76 kB) Dynamical Stability of Triple Stars V. V. Orlov and A. V. Petrova pp. 250-260 Full Text: PDF (105 kB) Internal Rotation of the Sun as Inferred from GONG Observations E. A. Gavryuseva, V. G. Gavryusev, and M. P. Di Mauro pp. 261-267 Full Text: PDF (106 kB)