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Angles between the Magnetic Moment and the Rotation Axis in Radio Pulsars with Hard Emission Astron. Lett. (IF 0.9) Pub Date : 2024-03-22 M. A. Timirkeeva, I. F. Malov
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Neutrino Emission of Neutron-Star Superbursts Astron. Lett. (IF 0.9) Pub Date : 2024-03-22 A. D. Kaminker, A. Yu. Potekhin, D. G. Yakovlev
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Investigation of the Ultraluminous X-ray Source VII Zw 403 ULX in the X-ray and Optical Ranges Astron. Lett. (IF 0.9) Pub Date : 2024-03-22 A. S. Vinokurov, K. E. Atapin, A. E. Kostenkov, Yu. N. Solovyeva
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Current Sheet as an Optimal Synchrotron Maser on a Radio Pulsar Astron. Lett. (IF 0.9) Pub Date : 2024-03-22 S. A. Koryagin
Abstract Using a relativistic plasma with an isotropic monoenergetic distribution of electrons and positrons as an example, we show that in the maser regime the maximum possible amplification of synchrotron radiation at a distance of one wavelength is achieved in a medium where the magnetic energy density is of the order of the particle energy density. This ratio of the energy densities corresponds
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Reverberation of the Vela Pulsar Wind Nebula Astron. Lett. (IF 0.9) Pub Date : 2024-03-22 A. E. Petrov, K. P. Levenfish, G. A. Ponomaryov
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Calculation of the Flux and Charge Ratio of High-Energy Atmospheric Muons at Sea Level* Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 A. B. Bouasla, R. Attallah
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A Method for Estimating the Spatial Period of Energy Release in Solar Flares Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 L. S. Ledentsov
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New Interstellar Extinction Maps Based on Gaia and Other Sky Surveys Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 G. A. Gontcharov, A. A. Marchuk, M. Yu. Khovrichev, A. V. Mosenkov, S. S. Savchenko, V. B. Il’in, D. M. Poliakov, A. A. Smirnov
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Origin of the Near-Surface Shear Layer of Solar Rotation Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 L. L. Kitchatinov
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Investigation of the Disk of the Be Star in the High-Mass X-ray Binary IGR J21343+4738 Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 E. A. Nikolaeva, I. F. Bikmaev, E. N. Irtuganov, M. A. Gorbachev, M. V. Suslikov, R. I. Gumerov, N. A. Sakhibullin
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SRG/ART-XC Galactic Plane Survey near Galactic Longitude $$\boldsymbol{L\simeq 20^{\circ}}$$ : Catalog of Sources Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 D. I. Karasev, A. N. Semena, I. A. Mereminskiy, A. A. Lutovinov, R. A. Burenin, R. A. Krivonos, S. Yu. Sazonov, V. A. Arefiev, M. V. Buntov, I. Yu. Lapshov, V. V. Levin, M. N. Pavlinsky, A. Yu. Tkachenko, A. E. Shtykovsky
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The Thermonuclear Rate of $${}^{\mathbf{9}}\mathbf{Be}$$ ( $$\mathbf{p}$$ , $$\boldsymbol{\gamma}$$ ) $${}^{\mathbf{10}}$$ B Reaction by Using the Modified Potential Model* Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 Leila Asgari, Hossein Sadeghi, Hassan Khalili
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Origin of Broad He II 4686 Å Emission in Early Spectra of SNe IIP Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 N. N. Chugai, V. P. Utrobin
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Expansion of the Soft X-ray Source and ‘‘Magnetic Detonation’’ in Solar Flares Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 A. B. Struminsky, A. M. Sadovski, I. Yu. Grigorieva
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X-ray Properties of the Luminous Quasar PG 1634+706 at $$z=1.337$$ from SRG and XMM-Newton Data Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 G. S. Uskov, S. Yu. Sazonov, M. R. Gilfanov, I. Yu. Lapshov, R. A. Sunyaev
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Nature of the Eclipsing Polar 1RXS J184542.4 $$+$$ 483134 Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 V. Yu. Kochkina, A. I. Kolbin, N. V. Borisov, I. F. Bikmaev
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Theoretical Period–Radius and Period–Luminosity Relations for Mira Variables with Solar Metallicity Astron. Lett. (IF 0.9) Pub Date : 2024-03-17 Yu. A. Fadeyev
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Induced Magnetic Field in Accretion Disks around Neutron Stars Astron. Lett. (IF 0.9) Pub Date : 2024-02-25 A. V. Kuzin
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Testing the Hypothesis about the Existence of a Planet Orbiting the Pulsar B0329+54 (J0332+5434) Astron. Lett. (IF 0.9) Pub Date : 2024-02-25 V. A. Potapov, S. A. Andrianov
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On the Influence of Magnetic Turbulence on the Spectra of Gamma-Ray Burst Afterglows Astron. Lett. (IF 0.9) Pub Date : 2024-02-25 Yu. A. Uvarov, A. M. Bykov
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Hydrodynamical Simulation of the Structure of the X-Ray Pulsar Accretion Channel: Accounting for Resonant Scattering Astron. Lett. (IF 0.9) Pub Date : 2024-02-25 I. D. Markozov, A. D. Kaminker, A. Y. Potekhin
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Evolutionary Status of Long-Period Radio Pulsars Astron. Lett. (IF 0.9) Pub Date : 2024-02-25 M. D. Afonina, A. V. Biryukov, S. B. Popov
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Influence of Space Curvature on the Moment of Inertia of a Pulsar Magnetic Field Astron. Lett. (IF 0.9) Pub Date : 2024-02-25 A. A. Matevosyan, D. P. Barsukov
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Search for Rotating Radio Transients in the Pushchino Multibeam Survey Astron. Lett. (IF 0.9) Pub Date : 2024-02-25 S. A. Tyul’bashev, M. A. Kitaeva, E. A. Brylyakova, V. S. Tyul’bashev, G. E. Tyul’basheva
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Activity of the Young Solar Analog HD 109833 and Estimates of the Mass Loss Rate from the Atmospheres of Its Two Planets Astron. Lett. (IF 0.9) Pub Date : 2024-01-29 I. S. Savanov
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A Maneuver of Escape from the Vicinity of a Collinear Libration Point Using Light Pressure Forces Astron. Lett. (IF 0.9) Pub Date : 2024-01-29 D. V. Shymanchuk, A. S. Shmyrov, V. A. Shmyrov
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Estimation of the Galactocentric Distance of the Sun from Cepheids Close to the Solar Circle Astron. Lett. (IF 0.9) Pub Date : 2024-01-29 V. V. Bobylev
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Optical Identification of Galaxy Clusters among SRG/eROSITA X-ray Sources Based on Photometric Redshift Estimates for Galaxies Astron. Lett. (IF 0.9) Pub Date : 2024-01-15 I. A. Zaznobin, R. A. Burenin, A. V. Meshcheryakov, M. R. Gilfanov, N. S. Lyskova, P. S. Medvedev, S. Yu. Sazonov, R. A. Sunyaev
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SDSS J085414.02+390537.3—A New Asynchronous Polar Astron. Lett. (IF 0.9) Pub Date : 2024-01-15 A. I. Kolbin, M. V. Suslikov, V. Yu. Kochkina, N. V. Borisov, A. N. Burenkov, D. V. Oparin
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Explanation of the Anomalous Outburst Activity of Comet 29P/Schwassmann–Wachmann 1: The Hypothesis about the Existence of Large Satellites Astron. Lett. (IF 0.9) Pub Date : 2024-01-15 Yu. D. Medvedev, S. R. Pavlov
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Strong Scattering Effects in the Emission of Soft Gamma-Ray Bursts Astron. Lett. (IF 0.9) Pub Date : 2024-01-15 E. M. Urvachev, D. S. Shidlovski, S. I. Blinnikov, S. I. Glazyrin
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Comparative Modeling of the 2012b Outburst of Supernova 2009ip Astron. Lett. (IF 0.9) Pub Date : 2024-01-15 E. M. Urvachev, S. I. Blinnikov, S. I. Glazyrin, D. S. Shidlovski
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On the Nature of the Rapid Color Changes of the UX Ori Star RY Lupi at Deep Minima Astron. Lett. (IF 0.9) Pub Date : 2024-01-15 D. V. Dmitriev, V. P. Grinin
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Flute Instability Effects for Disk Accretion onto Neutron Stars with Strong Magnetic Fields Astron. Lett. (IF 0.9) Pub Date : 2023-12-01
Abstract The flute instability at the inner edge of a thin diamagnetic accretion disk is analyzed. The magnetic field configuration model from Aly (1980) is used. We have analyzed a modified dispersion relation for the flute instability that takes into account the Keplerian disk rotation. We have derived the inner radius of the accretion disk within our analysis of the flute instability. We show that
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Influence of a Small-Scale Magnetic Field on the Heating of the Polar Cap of the Radio Pulsar J0901–4046 Astron. Lett. (IF 0.9) Pub Date : 2023-12-01
Abstract The pulsar J0901–4046 has a spin period \(P=75.8\) s and is the most slowly rotating one among the isolated radio pulsars. We have considered the influence of a small-scale magnetic field in the off-centered dipole model on the polar cap heating by the reverse positron current in the inner gap of the pulsar. We have assumed that the electron–positron pairs in the gap are created in bound states
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What Can We Learn about Compton-Thin AGN Tori from Their X-ray Spectra? * Astron. Lett. (IF 0.9) Pub Date : 2023-11-28 F. Melazzini, S. Sazonov
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Transient Events in the Circumnuclear Regions of AGNs and Quasars As Sources of Imitations of Proper Motions Astron. Lett. (IF 0.9) Pub Date : 2023-11-28 I. M. Khamitov, I. F. Bikmaev, M. R. Gilfanov, R. A. Sunyaev, P. S. Medvedev, M. A. Gorbachev
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Determination of the Parameters of a Nonlinear Kinematic Galactic Rotation Model Based on the Proper Motions and Radial Velocities of Stars from the Gaia DR3 Catalogue Astron. Lett. (IF 0.9) Pub Date : 2023-11-28 A. S. Tsvetkov, F. A. Amosov
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Determination of the Spiral Pattern Speed in the Milky Way from Young Open Star Clusters Astron. Lett. (IF 0.9) Pub Date : 2023-11-28 V. V. Bobylev, A. T. Bajkova
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Extreme Values of Sunspot Activity on a Long Time Scale Astron. Lett. (IF 0.9) Pub Date : 2023-11-25 Yu. A. Nagovitsyn, A. A. Osipova
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Peculiarities of Open Star Clusters with High Vertical Velocities from the Region of the Sco–Cen OB Association Astron. Lett. (IF 0.9) Pub Date : 2023-11-25 V. V. Bobylev, A. T. Bajkova
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SRGz: Machine Learning Methods and Properties of the Catalog of SRG/eROSITA Point X-ray Source Optical Counterparts in the DESI Legacy Imaging Surveys Footprint Astron. Lett. (IF 0.9) Pub Date : 2023-11-25 A. V. Meshcheryakov, V. D. Borisov, G. A. Khorunzhev, P. A. Medvedev, M. R. Gilfanov, M. I. Belvedersky, S. Yu. Sazonov, R. A. Burenin, R. A. Krivonos, I. F. Bikmaev, I. M. Khamitov, S. V. Gerasimov, I. V. Mashechkin, R. A. Sunyaev
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Optical Identification and Spectroscopic Redshift Measurements of 216 Galaxy Clusters from the SRG/eROSITA All-Sky Survey Astron. Lett. (IF 0.9) Pub Date : 2023-11-01
Abstract We present the results of the optical identification and spectroscopic redshift measurements of 216 galaxy clusters detected in the SRG/eROSITA all-sky X-ray survey. The spectroscopic observations were performed in 2020–2023 with the 6-m BTA telescope at the Special Astrophysical Observatory of the Russian Academy of Sciences, the 2.5-m telescope at the Caucasus Mountain Observatory of the
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SRGz: Classification of eROSITA Point X-ray Sources in the 1 $${\%}$$ DESI Region and Calibration of Photometric Redshifts* Astron. Lett. (IF 0.9) Pub Date : 2023-11-01
Abstract We consider the population of point X-ray sources from the two-year SRG/eROSITA survey in the 1 \(\%\) DESI spectroscopic survey region in the eastern Galactic hemisphere (eROSITA–1 \(\%\) DESI–East). The data under consideration combine a large survey area (compared to the medium-format Stripe82X and XMM-XXL X-ray surveys) and a record high completeness of spectroscopy for the optical counterparts
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Counter-Rotating Gaseous Disk and Star Formation in the S0 Galaxy NGC 934 Astron. Lett. (IF 0.9) Pub Date : 2023-10-03 O. K. Sil’chenko, A. V. Moiseev, D. V. Oparin, D. V. Zlydneva, D. V. Kozlova
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Spectral and Temporal Analysis of the Supergiant Fast X-ray Transient IGR J16195–4945 with SRG/ART-XC Astron. Lett. (IF 0.9) Pub Date : 2023-10-03 M. N. Satybaldiev, I. A. Mereminskiy, A. A. Lutovinov, D. I. Karasev, A. N. Semena, A. E. Shtykovsky
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Investigation of the Flaring Activity of BL Lac in July–November 2021 Astron. Lett. (IF 0.9) Pub Date : 2023-10-03 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, M. D. Afonina
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X-ray Halo of the Pulsar 4U 1538–52 from SRG Data Astron. Lett. (IF 0.9) Pub Date : 2023-10-03 A. E. Shtykovsky, A. A. Lutovinov, R. A. Krivonos, M. R. Gilfanov, P. S. Medvedev, I. A. Mereminskiy, V. A. Arefiev, S. V. Molkov, R. A. Sunyaev
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Detection of Radio Emission from the Geminga-Like Gamma-Ray Pulsar J1836+5925 Astron. Lett. (IF 0.9) Pub Date : 2023-10-01
Abstract The detection of radio emission from the gamma-ray pulsar J1836+5925 is reported. Rare events of radio emission from this object have been recorded with the LPA radio telescope at the Pushchino Radio Astronomy Observatory. A two- or three-component integrated profile and very narrow individual pulses are a peculiarity of the radio emission from the pulsar J1836+5925. The presence of an interpulse
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Maximal Mass Neutron Star as a Key to Superdense Matter Physics Astron. Lett. (IF 0.9) Pub Date : 2023-10-01
Abstract We propose a universal approximation of the equation of state of superdense matter in neutron star (NS) interiors. It contains only two parameters, the pressure and the density at the center of the maximally massive neutron star. We demonstrate the validity of this approximation for a wide range of different types of equations of state, including both baryonic and hybrid models. Combined with
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Secular Dynamics of a Number of Planets from the TESS Catalog Detected in Binary Star Systems Astron. Lett. (IF 0.9) Pub Date : 2023-09-04 A. V. Mel’nikov, Yu. G. Kopylova
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Collisional Plasma Temperature and Betatron Acceleration of Quasi-thermal Electrons in Solar Flares Astron. Lett. (IF 0.9) Pub Date : 2023-09-04 Yu. T. Tsap, V. F. Melnikov
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The Cepheids V371 Per and OGLE-LMC-CEP-2132: The First Crossing of the Instability Strip Astron. Lett. (IF 0.9) Pub Date : 2023-09-04 L. N. Berdnikov, E. N. Pastukhova
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Theoretical Mass Estimates for the Mira-Type Variable R Hydrae Astron. Lett. (IF 0.9) Pub Date : 2023-09-04 Yu. A. Fadeyev
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SDSS-IV MaNGA: Ionization Sources of the Extra-planar Diffuse Ionized Gas Astron. Lett. (IF 0.9) Pub Date : 2023-09-04 V. K. Postnikova, D. Bizyaev
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Recurrent Symbiotic Nova T Coronae Borealis before Outburst Astron. Lett. (IF 0.9) Pub Date : 2023-09-01
Abstract The results of photometric and spectral observations of T CrB obtained in a wide range of wavelengths in 2011–2023 are presented. We use the near-IR light curves to determine a new ephemeris \(JD_{\textrm{min}}=2455828.9+227.55E\) for the times of light minima when the red giant is located between the observer and the hot component. The flux ratio H \(\alpha\) /H \(\beta\) varied from \({\sim}3\)
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High-precision Astrometric Observations of the SRG Space Observatory with RTT-150 for Orbit Correction Control Astron. Lett. (IF 0.9) Pub Date : 2023-07-18 I. M. Khamitov, I. F. Bikmaev
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Optical Study of the Polar BM CrB in a Low State Astron. Lett. (IF 0.9) Pub Date : 2023-07-18 A. I. Kolbin, N. V. Borisov, A. N. Burenkov, O. I. Spiridonova, I. F. Bikmaev, M. V. Suslikov
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First Adiabatic Invariant and the Brightness Temperature of Relativistic Jets Astron. Lett. (IF 0.9) Pub Date : 2023-07-18 V. S. Beskin, T. I. Khalilov, V. I. Pariev