1. Publisher's announcement

   Announcement Pages: v - v

2. The influence of close binary evolution on the distribution of massive stars in the HR diagram

   • D. Vanbeveren

   OriginalPaper Pages: 1 - 12

3. Chandrasekhar'sX- andY-functions

   • M. H. Haggag
   • H. M. Machali
   • M. T. Attia

   OriginalPaper Pages: 13 - 18

4. Helium formation in a class of radiative cosmological models

   • A. A. Coley

   OriginalPaper Pages: 19 - 28

5. Time-dependentX- andY-functions by integral equation method

   • S. Karanjai
   • G. Biswas

   OriginalPaper Pages: 29 - 38

6. The plane trajectories of spin particles in the Schwarzschild field

   • K. Svirskas
   • K. Pyragas
   • A. Lozdienė

   OriginalPaper Pages: 39 - 52

7. Newtonian analogue of force and motion of a free particle in the gravitational field of theC-metric

   • T. Singh
   • R. S. Srivastava

   OriginalPaper Pages: 53 - 62

8. Nova Vulpeculae 1984 N 2 in 1985

   • Yu. K. Bergner
   • A. S. Miroshnichenko
   • D. B. Mukanov

   OriginalPaper Pages: 63 - 71

9. The high amplitude delta Scuti star SZ Lyncis revisited

   • M. Paparó
   • B. Szeidl
   • Hamid A. Mahdy

   OriginalPaper Pages: 73 - 82

10. The geometry of two-phase magnetofluid flows in a rotating system

    • C. Thakur

    OriginalPaper Pages: 83 - 90

11. Hugoniot adiabates for the waves of combustion in degenerate matter of supernovae

    • A. M. Khokhlov

    OriginalPaper Pages: 91 - 106

12. Unsteady MHD free-convection oscillatory flow on a porous plate in a rotating medium

    • P. K. Kythe
    • P. Puri

    OriginalPaper Pages: 107 - 114

13. The decay time of a satellite galaxy

    • K. S. V. S. Narasimhan
    • G. M. Ballabh

    OriginalPaper Pages: 115 - 119

14. Some physical considerations on NGC 1313

    • E. L. Agüero

    OriginalPaper Pages: 121 - 126

15. Nonlinear properties of electron acoustic wave turbulence in the geomagnetic tail

    • R. Bharuthram
    • P. K. Shukla

    OriginalPaper Pages: 127 - 140

16. Mass-to-luminosity ratio in binary galaxies

    • J. A. De Freitas Pacheco
    • Selma Junqueira

    OriginalPaper Pages: 141 - 147

17. The cause of the type I intermittency for hydrodynamic pulsation models

    • Toshiki Aikawa

    OriginalPaper Pages: 149 - 161

18. Sub-iron to iron nuclei in low-energy (50–200 MeV nucl⁻¹) cosmic rays as observed in the Skylab experiment

    • N. Durgaprasad
    • S. Biswas

    OriginalPaper Pages: 163 - 170

19. Unsteady MHD free-convective flow through a porous medium with hall currents

    • P. C. Ram

    Letters to the Editor Pages: 171 - 174

20. Gas infall in the nuclei of Seyfert galaxies observed?

    • Wolfgang Kundt

    Letters to the Editor Pages: 175 - 180

21. Book reviews

    • Milan Burša
    • Hans Joachim Haubold

    BookReview Pages: 181 - 183

22. Call for papers

    Announcement Pages: 184 - 184

23. List of forthcoming papers

    Legacy Pages: 185 - 185