Contents

Astronomy Letters

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Vol. 49, No. 5, 2023

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Cosmic Abundance of Iron

N. N. Chugai p. 209  abstract

Investigation of the Flaring Activity of BL Lac in July–November 2021

L. S. Ugol’kova, M. S. Pshirkov, V. P. Goranskij, N. P. Ikonnikova, B. S. Safonov, A. M. Tatarnikov, E. V. Shimanovskaya, M. A. Burlak, and M. D. Afonina p. 216  abstract

Counter-Rotating Gaseous Disk and Star Formation in the S0 Galaxy NGC 934

O. K. Sil’chenko, A. V. Moiseev, D. V. Oparin, D. V. Zlydneva, and D. V. Kozlova p. 229  abstract

X-ray Halo of the Pulsar 4U 1538–52 from SRG Data

A. E. Shtykovsky, A. A. Lutovinov, R. A. Krivonos, M. R. Gilfanov, P. S. Medvedev, I. A. Mereminskiy, V. A. Arefiev, S. V. Molkov, and R. A. Sunyaev p. 240  abstract

Spectral and Temporal Analysis of the Supergiant Fast X-ray Transient IGR J16195–4945 with SRG/ART-XC

M. N. Satybaldiev, I. A. Mereminskiy, A. A. Lutovinov, D. I. Karasev, A. N. Semena, and A. E. Shtykovsky p. 249  abstract

Properties of the Flare Energy Release in Force-Free Magnetic Flux Ropes

A. A. Solov’ev and E. A. Kirichek p. 257  abstract

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