Contents

Astronomy Reports

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Vol. 65, No. 2, 2021

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Contribution of Binary Stars to the Velocity Dispersion inside OB Associations with Gaia DR2 Data

A. M. Melnik and A. K. Dambis p. 71  abstract

Principal Component Analysis for Estimating Parameters of the L1287 Dense Core by Fitting Model Spectral Maps into Observed Ones

L. E. Pirogov and P. M. Zemlyanukha p. 82  abstract

Destruction of a Star during the Evolution of a Star + Supermassive Black Hole System

A. V. Fedorova and A. V. Tutukov p. 95  abstract

Restrictions on the Parameters of Black Hole and Plasma in the Vicinity of the Source Sagittarius A*

S. V. Chernov p. 110  abstract

Variations in the Orbital Periods of Eclipsing Binaries RY Aqr, AK Vir, and AX Vul

A. I. Khaliullina p. 126  abstract

Relativistic Reductions in Distance Measurements between Spacecraft with Picometer Accuracy

I. Yu. Vlasov, M. V. Sazhin, and V. N. Sementsov p. 137  abstract

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