Contents

Astronomy Letters

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Vol. 49, No. 4, 2023

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SDSS-IV MaNGA: Ionization Sources of the Extra-planar Diffuse Ionized Gas

V. K. Postnikova and D. Bizyaev p. 151  abstract

Theoretical Mass Estimates for the Mira-Type Variable R Hydrae

Yu. A. Fadeyev p. 167  abstract

The Cepheids V371 Per and OGLE-LMC-CEP-2132: The First Crossing of the Instability Strip

L. N. Berdnikov and E. N. Pastukhova p. 175  abstract

Secular Dynamics of a Number of Planets from the TESS Catalog Detected in Binary Star Systems

A. V. Mel’nikov and Yu. G. Kopylova p. 191  abstract

Collisional Plasma Temperature and Betatron Acceleration of Quasi-thermal Electrons in Solar Flares

Yu. T. Tsap and V. F. Melnikov p. 200  abstract

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