Astronomy Letters -- October 2004 Volume 30, Issue 10, pp. 657-727 CMB Recombination Lines of Hydrogen: The Differential Spectrum V. K. Dubrovich and S. I. Grachev pp. 657-662 Full Text: PDF (249 kB) A Semianalytical Method for Calculating the Parameters of the Electromagnetic Halos around Extragalactic Gamma-Ray Sources S. R. Kel'ner, D. V. Khangulyan, and F. A. Aharonian pp. 663-668 Full Text: PDF (178 kB) Broadband X-ray Spectrum of XTE J1550–564 during the Outburst of 2003 V. A. Aref'ev, M. G. Revnivtsev, A. A. Lutovinov, and R. A. Sunyaev pp. 669-674 Full Text: PDF (193 kB) A White Dwarf in the State of an Ejector N. R. Ikhsanov, V. V. Neustroev, and N. G. Beskrovnaya pp. 675-684 Full Text: PDF (251 kB) Weakly Radiating Radio Pulsars V. S. Beskin and E. E. Nokhrina pp. 685-693 Full Text: PDF (224 kB) Disk Wind in Young Binaries and the Origin of the Cyclic Activity of Young Stars V. P. Grinin, L. V. Tambovtseva, and N. Ya. Sotnikova pp. 694-706 Full Text: PDF (518 kB) Radial Pulsations of Helium Stars with Masses from 10 to 50M[sun] Yu. A. Fadeyev and M. F. Novikova pp. 707-714 Full Text: PDF (276 kB) Synchronous Microwave Brightenings of Solar Active Regions from RATAN-600 Spectral Observations O. A. Golubchina, S. Kh. Tokhchukova, V. M. Bogod, H. A. Garcia, and V. I. Garaimov pp. 715-727 Full Text: PDF (382 kB)