1. Absorption of Photons from Distant Gamma-Ray Sources

   • A. N. Popov
   • D. P. Barsukov
   • A. V. Ivanchik

   OriginalPaper 18 October 2018 Pages: 579 - 587

2. Composition of Cosmic Rays with E⁰ ⩾ 10¹⁷ eV Based on Data from the Ground Scintillation Detectors of the Yakutsk EAS Array

   • A. V. Glushkov
   • M. I. Pravdin
   • A. V. Saburov

   OriginalPaper 18 October 2018 Pages: 588 - 592

3. Broadband Spectrum of the X-ray Binary M33 X-6 from NuSTAR and Swift–XRT Data: An Extragalactic Z-Source?

   • S. M. Nikolaeva
   • R. A. Krivonos
   • S. Yu. Sazonov

   OriginalPaper 18 October 2018 Pages: 593 - 602

4. Searching for the Young Kinematic Group Associated with HD 166191

   • I. S. Potravnov
   • M. V. Eselevich
   • I. V. Sokolov

   OriginalPaper 18 October 2018 Pages: 603 - 615

5. Evolution and Period Change in RR Lyr Variables of the Globular Cluster M 3

   • Yu. A. Fadeyev

   OriginalPaper 18 October 2018 Pages: 616 - 620

6. Non-LTE Effects of Helium Lines in Late-B and A Stars

   • S. A. Korotin
   • T. A. Ryabchikova

   OriginalPaper 18 October 2018 Pages: 621 - 628

7. New Features of Parenago’s Discontinuity from Gaia DR1 Data

   • V. V. Vityazev
   • A. V. Popov
   • V. I. Kiyaev

   OriginalPaper 18 October 2018 Pages: 629 - 644

8. Solar Cycle Asymmetry as a Consequence of Fluctuations in Dynamo Parameters

   • L. L. Kitchatinov
   • A. A. Nepomnyashchikh

   OriginalPaper 18 October 2018 Pages: 645 - 651