Title Page

Contents

Photometric Behaviour and General Characteristics of the Nova HR Delphini
D. Raikova (in Russian, Summary in English)

Evolution of the Nova HR Delphini Spectrum
D. Raikova (in Russian, Summary in English)

Comparison of the Physical Conditions and the Chemical Composition of the HR Delphini and the V367 Cygni Envelopes
D. Raikova, V. Dobrichev (in Russian, Summary in English)

The Evolution of the Nova LV Vulpeculae Spectrum
D. Raikova, V. Dobrichev

Rotational Velocities of Metallic-Line Stars
V. Dobrichev (in Russian, Summary in English)

Individual Colour-Colour Diagrams of A_p-Stars in the Vilnius Photometrical System
A. Nikolov, I. Iliev (in Russian, Summary in English)

A Note on Blackett’s Hypothesis and the A_p-Stars
R. Radkov

Accretion Discs
L. Filipov (in Russian, Summary in English)

Modulus of Evolution of the Globular Clusters
N. M. Spassova, P. G. Dimitrov (in Russian, Summary in English)

The Electrophotometric Device in Belogradchik Astronomical Observatory
A. N. Tomov (in Russian, Summary in English)

Results from the Spectrophotometric Research of Some Arakelian Galaxies
V. K. Golev, Z. I. Tsvetanov, G. T. Petrov (in Russian, Summary in English)

Morphological Investigation of Galaxies with High Surface Brightness. II. Akn 26, 27, 28, 31, 32 and 79
H. S. Markov, V. K. Golev, Z. I. Tsvetanov, G. T. Petrov (in Russian, Summary in English)

Self-consistent Mega-Cosmology
R. G. Zaycoff

Formation of Surge Prominences in the Solar Atmosphere
V. Dermendjiev, G. Zahariev, D. Kokotanekov