Contents
Astronomy Letters

Vol. 25, No. 6, 1999 June

Simultaneous English language translation of the journal is available from “ / Interperiodica” (Russia).
Distributed worldwide by the American Institute of Physics. Astronomy Letters ISSN 1063-7737.

A New Activity Cycle of NGC 4151: Evidence for the Existence of an Accretion Disk

V. M. Lyuty and V. T. Doroshenko p. 341  abstract

Long-Term Variability of the Hard X-ray Source GRS 1758–258: GRANAT/SIGMA Observations

S. I. Kuznetsov^,, M. R. Gilfanov^,, E. M. Churazov^,, R. A. Sunyaev^,, A. V. D’yachkov, N. G. Khavenson,
B. S. Novikov, R. S. Kremnev, P. Goldoni, A. Goldwurm, P. Laurent, J. Paul,
J.-P. Roques, E. Jourdain, L. Bouchet, and G. Vedrenne p. 351  abstract

Modeling of the Light Curve and Parameters of the Supernova 1987A

S. I. Blinnikov p. 359  abstract

The Role of Protons and Particles in Rapid Nucleosynthesis
in the Envelope of a Collapsing Supernova

I. V. Panov and D. K. Nadyozhin p. 369  abstract

Difference between the Frequency Dependences of the Integrated-Profile Widths
for Millisecond and “Normal” Pulsars

A. D. Kuz’min and B. Ya. Losovskii p. 375  abstract

Identification of Radio Sources in Clusters of Galaxies

A. G. Gubanov and V. P. Reshetnikov p. 380  abstract

Spectroscopic Variability of the Planetary Nebula IC 4997 over 25 Years (1972–1996)

E. B. Kostyakova p. 389  abstract

Long-Term Monitoring of the Long-Period Variable W Hydrae
in the 1.35-cm Water-Vapor Radio Line

G. M. Rudnitskii, E. E. Lekht, and I. I. Berulis p. 398  abstract

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