Volume 2 (1977)



Contents

Characteristic Features of the Cyclic Change of Solar Activity after 1610
A. Bonov

On the Dependence of Heigh of the Prominences on the Solar Cycle and Heliographic Latitude
V. Dermendjiev

On the Space Distribution of Solar Prominences
V. Dermendjiev

Statistical Investigation of Light and Colour Changes of Ap-Stars
R. Radkov

On the Particular Chemical Composition of AP-Stars
R. Radkov, S. Milcheva

Proper Motions of Bright Red Giants in Globular Clusters. I. The Globular Cluster M 13
N. Spassova

Proper Motions of Bright Red Giants in Globular Clusters. II. The Globular Clusters M92 and M 3
N. Spassova

On the Nature of the calibration Curve in Stellar Photographic Photometry
S. Vladimirov

Generalized ksi^2-Method for Investigation of the Problem for the Existence of Second-Order Clusters of Galaxies. I. Theory
M. Kalinkov

Generalized ksi^2-Method for Investigation of the Problem for the Existence of Second-Order Clusters of Galaxies. II. Clusters from Abell's and Zwicky's Catalogues
M. Kalinkov, B. Tomov