Astronomy Reports最新文献

First Spectral Study of New Low-Mass Eclipsing Binary System V3157 Cyg (3UC 281–203711) 新低质量食双星V3157 Cyg （3UC 281-203711）的首次光谱研究

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-24 DOI: 10.1134/S1063772926700800

S. Yu. Gorda, A. N. Tarasenkov

引用次数: 0

Spherization of the Velocity Field of Cosmological Perturbations Near Density Extrema 密度极值附近宇宙微扰速度场的球化

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-24 DOI: 10.1134/S1063772926700794

A. N. Baushev

引用次数: 0

Fractal Analysis of Dwarf Novae 矮新星的分形分析

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-24 DOI: 10.1134/S1063772926700848

M. E. Tsuranova, A. N. Tarasenkov, L. G. Moskovchenko

引用次数: 0

Analysis of the Time‑Lagged Response of Geomagnetic Indices to High‑Speed Solar Wind Streams from Hourly and Minute‑Resolution Data 从小时和分分辨率数据分析地磁指数对高速太阳风流的时间滞后响应

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-24 DOI: 10.1134/S1063772926700770

B. Aljehani, B. Badruddin, M. Derouich

{"title":"Analysis of the Time‑Lagged Response of Geomagnetic Indices to High‑Speed Solar Wind Streams from Hourly and Minute‑Resolution Data","authors":"B. Aljehani, B. Badruddin, M. Derouich","doi":"10.1134/S1063772926700770","DOIUrl":"10.1134/S1063772926700770","url":null,"abstract":"This study investigates the time-lagged response of geomagnetic indices (Dst, SYM-H, and AE) to high-speed solar wind streams by analyzing 25 HSS-driven geomagnetic storms (Dstmin ≤ −30 nT) during Solar Cycle 24. Cross-correlation analysis is applied between solar wind plasma and magnetic field parameters and geomagnetic indices at 1-hour and 1-minute temporal resolution. The results show that geomagnetic activity is most strongly correlated with combined parameters involving the southward interplanetary magnetic field component (Bz) and the dawn–dusk electric field (Ey), along with their variability. Time lags between solar wind drivers and geomagnetic indices range from 1 to 6 hours, with increased variability reflecting the gradual and modulated energy input characteristic of HSS-driven storms. High-resolution data provide more precise lag estimates by capturing rapid variations in Bz and Ey. The AE index exhibits stronger and more immediate responses to IMF strength and velocity gradients, whereas SYM-H shows weaker sensitivity to solar wind velocity structures. These findings highlight the role of sustained driving and IMF orientation in controlling geomagnetic response and demonstrate the importance of high-resolution observations for improving the characterization of solar wind-magnetosphere coupling.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"70 6","pages":"717 - 739"},"PeriodicalIF":0.8,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Implementation of the Classical Method for Identifying Stellar Configurations Using Brightness Data 利用亮度数据识别恒星结构的经典方法的实现

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-24 DOI: 10.1134/S1063772926700824

A. E. Svetlov, P. R. Zapevalin

引用次数: 0

An Analytical Study on the Co-Evolution of Central Black Holes and Globular Clusters System 中心黑洞与球状星团系统协同演化的分析研究

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-24 DOI: 10.1134/S1063772926700769

Ahmed H. Abdullah, Israa A. Mohammed Ali, R. Z. E. Alsaberi

引用次数: 0

Software Package pAstroCORE for Planning Radio Astronomical Observations 计划射电天文观测软件包pAstroCORE

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-24 DOI: 10.1134/S1063772926700812

A. G. Rudnitskiy, I. I. Bulygin, M. A. Shchurov, P. R. Zapevalin, A. V. Fraerman, T. A. Syachina

{"title":"Software Package pAstroCORE for Planning Radio Astronomical Observations","authors":"A. G. Rudnitskiy, I. I. Bulygin, M. A. Shchurov, P. R. Zapevalin, A. V. Fraerman, T. A. Syachina","doi":"10.1134/S1063772926700812","DOIUrl":"10.1134/S1063772926700812","url":null,"abstract":"Existing software for planning and numerical simulations of radio astronomical observations are often highly specialized and have limitations in terms of flexibility, interactive data visualization, and support for arbitrary observation configurations. This makes the development of a software package for planning radio astronomy observations urgent. In this paper, the pAstroCORE software package, a modular and expandable universal system for configuring radio astronomical observations and estimating their parameters has been described. The functionality of software package includes configuration (selection of sources, telescopes, and observation modes) and calculation components (source visibility and time on source, interferometer geometry, the evolution of telescope positions over time, etc.). The developed software package pAstroCORE built on a multi-level abstract architecture is the basis for the further implementation of a fundamentally new system for the full cycle of planning radio astronomical observations, starting from the design of observations to the calculation of key parameters, visualization of results and, subsequently, the optimization of observations according to specified criteria and constraints for both ground-based and space-borne observatories.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"70 6","pages":"677 - 696"},"PeriodicalIF":0.8,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimation and Prediction of Celestial Pole Offsets 天极偏移的估计与预测

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-24 DOI: 10.1134/S1063772926700836

R. M. Urunova, S. L. Kurdubov

{"title":"Estimation and Prediction of Celestial Pole Offsets","authors":"R. M. Urunova, S. L. Kurdubov","doi":"10.1134/S1063772926700836","DOIUrl":"10.1134/S1063772926700836","url":null,"abstract":"Very Long Baseline Interferometry (VLBI) is the most accurate technique for determining celestial pole coordinates and investigating Earth’s nutation. This study presents the results of an analysis of long-term international 24-hour VLBI observations and an approach based on short-duration sessions of the Russian Quasar VLBI Network. Combining hourly observations can improve the timeliness of celestial pole coordinate estimation and prediction. It is shown that the accuracy of nutation angle estimates obtained using this approach is comparable to that achieved by global solutions: both methods provide estimates with an accuracy of approximately 150 microarcseconds over the period 2019–2025. In addition, a two-component harmonic model of Earth’s Free Core Nutation (FCN) is developed to describe the interaction between the solid mantle and the fluid core. Unevenly sampled time series are analyzed using the Lomb–Scargle method. The results demonstrate the potential of regular high-frequency observations and further refinement of FCN models for improving prediction accuracy and advancing our understanding of the dynamics of Earth’s interior.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"70 6","pages":"761 - 767"},"PeriodicalIF":0.8,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1063772926700836.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solution of Photogravitational Elliptic Restricted Triangular Four Body Problem with Oblate Primaries in Lie Series 李级数中具有扁圆原色的光引力椭圆限制三角形四体问题的解

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-24 DOI: 10.1134/S1063772926700782

A. Chakraborty

{"title":"Solution of Photogravitational Elliptic Restricted Triangular Four Body Problem with Oblate Primaries in Lie Series","authors":"A. Chakraborty","doi":"10.1134/S1063772926700782","DOIUrl":"10.1134/S1063772926700782","url":null,"abstract":"This study examines the elliptic restricted four-body problem in which three primaries move in Keplerian elliptic orbits while preserving an equilateral triangular configuration. The model incorporates mutual gravitational interactions, radiation pressure from the dominant primary, and oblateness effects of the two equal-mass secondary primaries. Planar equilibrium points are computed and their linear stability is analyzed using a semi-analytical approach. Eight equilibrium points are identified, all of which depend sensitively on the perturbing parameters. Of these, only one symmetric pair, located about the x-axis, is found to be linearly stable, while the remaining points are unstable. To approximate the system dynamics, iterative formulations based on Lie series expansion are developed. The linearized motion in the vicinity of the stable equilibria is then examined for variations in mass ratio, radiation pressure, orbital eccentricity, and oblateness coefficients. A comparison between trajectories obtained via direct numerical integration and those derived from the Lie series demonstrates strong agreement, confirming the accuracy of the semi-analytical method. The applicability of the model is further illustrated through its implementation in the TRAPPIST-1 system (planets (c) and (g)) and the Barnard’s Star system (planets (b) and (d)). In both systems, four equilibrium points are obtained, consisting of two collinear and two triangular points. Periodic orbits around the triangular equilibria derived from the Lie series closely match those obtained via numerical integration.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"70 6","pages":"740 - 760"},"PeriodicalIF":0.8,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photometric and Spectral Evolution of the Symbiotic Nova HM Sagittae Since 2003 2003年以来共生新星人马座HM的光度和光谱演化

IF 0.8 4区物理与天体物理

Astronomy Reports Pub Date : 2026-09-23 DOI: 10.1134/S1063772926700708

N. P. Ikonnikova, V. I. Shenavrin, G. V. Komissarova, M. A. Burlak, A. V. Dodin

{"title":"Photometric and Spectral Evolution of the Symbiotic Nova HM Sagittae Since 2003","authors":"N. P. Ikonnikova, V. I. Shenavrin, G. V. Komissarova, M. A. Burlak, A. V. Dodin","doi":"10.1134/S1063772926700708","DOIUrl":"10.1134/S1063772926700708","url":null,"abstract":"We present photometric and spectral monitoring of the symbiotic system HM Sge, which consists of a Mira variable with a dust shell and a hot white dwarf ionizing the surrounding gaseous nebula. The system underwent a nova-like outburst in 1975 and experienced a high-activity episode during 2018–2021. (UBV) photometry from 2003 to 2025 shows monotonic fading at ( sim {kern 1pt} {{0.05}^{m}})/yr until 2018, followed by a ({{0.3}^{m}}) brightening peaking in 2021 and a decline by 2025 to the faintest level in five decades of monitoring. Near-infrared observations ((JHKLM), 2009–2025), combined with archival data, reveal Mira pulsations with a period of 532d and long-term variability driven by changes in the optical depth of the dust shell. Spectral monitoring (2016–2025) reveals a substantial evolution in the emission spectrum of the gaseous envelope. The 2018–2021 high-activity episode was accompanied by enhanced fluxes in recombination lines (H I, He I, He II) and forbidden transitions ([O I], [Ar V], [Fe VI], [Ca VII]), together with a 17-fold brightening of the Raman-scattered O VI (lambda ) 6725 Å line. We report the first detection of the [Fe X] (lambda ) 6374 Å line in HM Sge. Monitoring this line from 2007 to 2025 shows its equivalent width growing through 2017—indicating gradual coronal heating—then declining by 2021, likely reflecting altered accretion conditions and/or hot-component properties during the high-activity episode. We propose that both the 1975 outburst and the 2018–2021 high-activity episode may be linked to periastron passage of the binary components; if so, the ( sim {kern 1pt} 46)-year interval would constrain the system’s orbital period.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"70 5","pages":"561 - 581"},"PeriodicalIF":0.8,"publicationDate":"2026-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0