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Long-Term Optical Spectroscopy of B[e] Star CI Cam in a Quiet State 静态 B[e] 星 CI Cam 的长期光学光谱分析
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-29 DOI: 10.1134/S1063772924700501
V. G. Klochkova, A. S. Miroshnichenko, V. E. Panchuk

High-resolution optical spectra of the B[e] star CI Cam were obtained on arbitrary dates 2002–2023 using the 6-meter BTA telescope with the echelle spectrograph NES. The variability over time of the powerful emissions of Hα and He I profiles is found. For two-peak emissions with “rectangular” profiles, the intensity ratio of blue-shifted and red-shifted peaks is ({text{V/R}} geqslant 1), except one date. A decrease in the intensity of all double-peaked emissions with “rectangular” profiles was revealed as they moved away in time from the 1998 outburst. The average radial velocity for emissions of this type for all observation dates varies in the range ({{V}_{r}}({text{emis}}{-} d) = ) ( - (50.8 {div} 55.7) pm 0.2) km/s. The half-amplitude of the change (standard deviation) is equal to (Delta {{V}_{r}} = 2.5) km/s. The velocity for single-peaked ion emissions (Si III, Al III, Fe III) differs little from the values of ({{V}_{r}}({text{emis}}{-} d)), but the measurement accuracy for these emissions is worse: the average error for different dates ranges from 0.4 to 1.3 km/s. The systemic velocity is assumed to be ({{V}_{{{text{sys}}}}} = - 55.4 pm 0.6) km/s according to the stable position of the forbidden emission [N II] 5755 Å. The position of single-peak emissions [O III] 4959 and 5007 Å is also stable: ({{V}_{r}}([{text{O}};{text{III}}]) = ) ( - 54.2 pm 0.4) km/s. Emissions [O I] 5577, 6300, 6363 Å, [Ca II] 7291 and 7324 Å are absent from the spectra. Appearance of the emission near 4686 Å is an infrequent event, its intensity rarely exceeds the noise level. Only a wide asymmetric emission with an intensity of about 16% above the continuum was registered in the spectrum for September 3, 2015. Questions arise about the use of this emission to estimate the period of variability of the star and about localization of this feature in the CI Cam system. The photospheric absorptions of N II, S II, and Fe III with a variable position are identified.

摘要 利用配备了梯形光谱仪NES的6米BTA望远镜,在2002-2023年的任意日期获得了B[e]星CI Cam的高分辨率光学光谱。发现了 Hα 和 He I 的强辐射剖面随时间的变化。对于具有 "矩形 "剖面的双峰发射,蓝移峰和红移峰的强度比为({text{V/R}} geqslant 1 ),只有一个日期除外。所有具有 "矩形 "剖面的双峰辐射的强度都随着它们远离 1998 年爆发的时间而下降。在所有观测日期中,这类发射的平均径向速度变化范围为 ({{V}_{r}}({text{emis}}{-} d) = )(- (50.8 {div} 55.7) pm 0.2) km/s。变化的半幅(标准偏差)等于 (Delta {{V}_{r}} = 2.5) km/s。单峰离子发射(Si III、Al III、Fe III)的速度与 ({{V}_{r}}({{text{emis}}{-} d)) 的值相差不大,但这些发射的测量精度较差:不同日期的平均误差在 0.4 到 1.3 km/s 之间。根据禁止辐射[N II] 5755 Å的稳定位置,系统速度被假定为 ({{V}_{{text{sys}}}}} = - 55.4 pm 0.6) km/s。单峰辐射[O III] 4959 和 5007 Å的位置也是稳定的:({{V}_{r}}([{{O}};{{III}}]) = )( - 54.2 pm 0.4) km/s.光谱中没有[O I] 5577、6300、6363 Å,[Ca II] 7291 和 7324 Å的发射。4686 Å 附近的辐射出现得并不频繁,其强度很少超过噪声水平。只有在 2015 年 9 月 3 日的光谱中出现了一个宽的不对称发射,其强度高于连续面约 16%。利用这种发射来估算恒星的变异周期以及在 CI Cam 系统中定位这一特征的问题由此产生。确定了具有可变位置的 N II、S II 和 Fe III 的光层吸收。
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引用次数: 0
ET Dra Activity According to Observations in 2018–2023 2018-2023 年观测到的 ET Dra 活动
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-29 DOI: 10.1134/S1063772924700549
I. S. Savanov, S. A. Naroenkov, M. A. Nalivkin, A. N. Tarasenkov, E. S. Dmitrienko

The results of new photometric observations of the chromospherically active star ET Dra, performed using telescopes of the Zvenigorod INASAN Observatory, the Russian-Cuban Observatory in the territory of the Republic of Cuba (Havana), and the Terskol INASAN Observatory (a total of 8 sets of observations) with the addition of archival observations of the Kamogata Wide-field Survey. Variations in the shape of the light curve caused by the rotational modulation of a star with spots on the surface, as well as studies of the long-term variability of the star’s brightness, were investigated based on the data acquired in 2018–2023. Characteristic changes in the ET Dra light curve were noted including a decrease of the stellar brightness in the (V) filter, its cyclic variations, and subsequent brightness increase. The shape of the phase curve and the duration of the extended minimum of brightness vary. During the HJD 245 9670–245 9715 interval, the amplitude of the star’s brightness variability reached a maximum value of more than 0.4m, as it was in 1990. The surface temperature inhomogeneities maps were calculated and estimates of the spottedness parameter S of the object were performed for each of the 8 sets of observations. Maximum value of parameter S was 32.2‒33.5%. Based on the constructed power spectra, the values of possible cycles of long-term activity of the star were obtained as 570 and 1160d (1.56 and 3.18 years, respectively).

摘要利用兹韦尼格罗德 INASAN 天文台、古巴共和国境内(哈瓦那)的俄罗斯-古巴天文台和特尔斯科尔 INASAN 天文台的望远镜(共 8 组观测数据)对色球活动恒星 ET Dra 进行了新的测光观测,并增加了 Kamogata 宽视场巡天的档案观测数据。根据 2018-2023 年获得的数据,研究了表面有斑点的恒星旋转调制引起的光曲线形状变化,以及恒星亮度长期变化的研究。注意到ET Dra光曲线的特征性变化,包括恒星亮度在(V)滤光片中的下降、周期性变化以及随后的亮度上升。相位曲线的形状和延长的最低亮度持续时间各不相同。在HJD 245 9670-245 9715区间,恒星亮度变化的振幅达到了最大值,超过了0.4米,与1990年的情况一样。对 8 组观测数据中的每一组都计算了表面温度不均匀度图,并估算了天体的斑度参数 S。参数 S 的最大值为 32.2-33.5%。根据构建的功率谱,得出该恒星可能的长期活动周期值为 570d 和 1160d(分别为 1.56 年和 3.18 年)。
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引用次数: 0
The Detection and Investigation of Exoplanets with MASTER Global Network Telescopes 利用 MASTER 全球网络望远镜探测和调查系外行星
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-29 DOI: 10.1134/S1063772924700513
V. M. Lipunov, A. N. Tarasenkov, A. S. Kuznetsov, P. V. Balanutsa, G. A. Antipov, Ya. Yu. Kechin, N. V. Tyurina, E. S. Gorbovskoy, D. A. H. Buckley, C. Francile, F. Podesta, A. G. Tlatov, R. Rebolo Lopez, N. M. Budnev, O. A. Gress, V. V. Yurkov

The paper presents the method for detecting exoplanets in the image archive obtained by telescopes of the MASTER Global Network since 2002. The unique archive represents homogeneous photometric data obtained over 20 years for the northern (MASTER-Amur, MASTER-Tunka, MASTER-Kislovodsk, M-ASTER-Tavrida, MASTER-IAC, MASTER-OAGH) and 11 years for the southern sky (MASTER-OAFA, MASTER-SAAO). Algorithm of gamma-ray burst error box observation on the MASTER wide-field telescopes make it possible to detect transit phenomena and find exoplanets in archival data. The article presents the results of a photometric analysis of the TESS exoplanet candidate TOI–3570.01.

摘要本文介绍了从 2002 年以来 MASTER 全球网络望远镜获得的图像档案中探测系外行星的方法。这个独特的档案包含了20年来在北部天空(MASTER-Amur、MASTER-Tunka、MASTER-Kislovodsk、M-ASTER-Tavrida、MASTER-IAC、MASTER-OAGH)和11年来在南部天空(MASTER-OAFA、MASTER-SAAO)获得的同质测光数据。MASTER 宽视场望远镜的伽马射线暴误差盒观测算法使探测凌日现象和在档案数据中发现系外行星成为可能。文章介绍了对 TESS 系外行星候选者 TOI-3570.01 的测光分析结果。
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引用次数: 0
Force Free Magnetic Flux Rope with a High Current Density on the Axis 轴上具有高电流密度的无力磁通绳
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-29 DOI: 10.1134/S1063772924700550
A. A. Solov’ev

A new model of a force-free magnetic flux rope with a high concentration of electric current on the axis is presented. The general property of axisymmetric force-free magnetic ropes is that with the exit of the top of the magnetic loop-rope into the corona, the external pressure that keeps it from lateral expansion steadily decreases, and with some critical decrease in this pressure, the longitudinal magnetic field of the rope becomes zero on the surface where the electric current changes its sign (it is current inversion surface—CIS). In this case, the force-free parameter (alpha (r)) and the azimuthal electric current jϕ(r) experience a second-order discontinuity on this surface, so that in the vicinity of CIS their values begin to increase without limit. The current (drift) speed of electrons here will inevitably exceed the speed of ion sound. This serves as a trigger for the heating of non-isothermal plasma (so it turns out Te ( gg ) Ti) and the excitation of plasma ion-acoustic instability of the plasma not only near the CIS, but also in the central region of the rope, on its axis, where the current density is especially high. The appearance of anomalous resistance leads to rapid dissipation of the magnetic field and the generation of a super-Dreicer electric field. The Parker effect, associated with the equalization (with some delay) of the torque along the axis of the rope due to the transfer of the azimuthal field to the region of energy release, leads to quasiperiodic pulsations of hard flare radiation and, ultimately, ensures the flare release of the most part of free magnetic energy accumulated in the rope.

摘要 介绍了轴上电流高度集中的无力磁通绳的新模型。轴对称无力磁通绳的一般特性是,随着磁环绳顶部进入电晕,使其不横向膨胀的外部压力逐渐减小,当该压力减小到某个临界值时,在电流符号改变的表面(即电流反转面-CIS)上,磁环绳的纵向磁场变为零。在这种情况下,无力参数(alpha (r))和方位电流jj(r)在该表面上经历二阶不连续性,因此在CIS附近,它们的值开始无限制地增加。电子在这里的电流(漂移)速度将不可避免地超过离子声速。这将引发非等温等离子体的加热(事实证明 Te ( gg ) Ti)以及等离子体离子声不稳定性的激发,不仅在 CIS 附近,而且在绳索的中心区域,在其轴线上,这里的电流密度特别高。反常电阻的出现导致磁场迅速耗散,并产生超德雷克电场。帕克效应与由于方位磁场转移到能量释放区域而导致的沿绳索轴线的扭矩均衡(有一定的延迟)有关,导致硬耀斑辐射的准周期脉动,并最终确保在绳索中积累的大部分自由磁能的耀斑释放。
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引用次数: 0
Modern Stellar Astronomy 2023 现代恒星天文学 2023
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-29 DOI: 10.1134/S1063772924700525
O. Yu. Malkov, E. Yu. Kilpio, O. B. Dluzhnevskaya

We provide an analytic review of problems of the modern stellar astronomy. It mostly based on talks presented at the thirteenth annual conference on Modern Stellar Astronomy, held in Volgograd State University (Russia) in May 2023.

摘要 我们对现代恒星天文学的问题进行了分析综述。它主要基于 2023 年 5 月在伏尔加格勒国立大学(俄罗斯)举行的第 13 届现代恒星天文学年会上发表的演讲。
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引用次数: 0
Time Structure of the Average Rotation Measure for Accretion Disk in Shearing Box Approximation 剪切盒近似法中吸积盘平均旋转测量值的时间结构
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-29 DOI: 10.1134/S1063772924700495
M. A. Buldakov, A. S. Andrianov

Temporal structure of the average rotation measure and the evolution of energetic characteristics of accretion disk in a shearing box approximation are considered. The temporal structure of rotation measure consists of both low- and high-frequency alternating sign oscillations. The mechanisms responsible for these oscillations and their connection with the disk dynamo are discussed. The 2D distributions and the vertical structure of rotation measure and magnetic energy are analysed for times corresponding to extrema and close to zero values of rotation measure. It is shown that the extrema of rotation measure are formed on account of several individual turbulent structures with large amplitudes that are related to magnetorotational and Parker instabilities. It is found that the spatial locations of these structures correspond to areas with high local magnetic energy. The possibility of estimating the period of disk dynamo using measurements of rotation measure is discussed. Cases of Sgr A* and M87* are considered.

摘要 研究了剪切盒近似中平均自转量的时间结构和吸积盘能量特征的演变。自转量的时间结构包括低频和高频交替符号振荡。讨论了这些振荡的机制及其与磁盘动力的联系。分析了旋转量和磁能在极值和接近零值时的二维分布和垂直结构。结果表明,自转量极值是由几个具有大振幅的单独湍流结构形成的,这些结构与磁动和帕克不稳定性有关。研究发现,这些结构的空间位置与局部磁能较高的区域相对应。讨论了利用自转量的测量来估计磁盘发电机周期的可能性。考虑了 Sgr A* 和 M87* 的情况。
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引用次数: 0
The Evolutionary Status of the Galaxy’s X-ray Binary Stars 银河系 X 射线双星的演化状况
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-29 DOI: 10.1134/S1063772924700562
A. V. Tutukov, A. V. Fedorova

The article is devoted to the analysis of the evolutionary status of the X-ray binary stars of the Galaxy. It is shown that the assumption of the conservative evolution of these binary systems leads to an overestimation of the X-ray luminosity of the Galaxy by 3–4 orders. The total observed rate of accretion of matter by relativistic components of X-ray binaries is close to ( {sim} {{10}^{{ - 6}}}{{M}_{ odot }}{text{/}})yr, while the theoretically possible rate reaches ( {sim} {{10}^{{ - 2}}}{{M}_{ odot }}{text{/}})yr. The contradiction between these estimates is eliminated if two factors are taken into account. The first of them is the formation of a common envelope in massive X-ray binary systems after filling the Roche lobe by the donor and the brief phase of a bright X-ray source. The common envelope eliminates the output of X-ray radiation generated during accretion, and also leads to the loss of part of the donor’s matter from the system. The second factor is the presence of intense stellar wind of donors in massive X-ray binary, as well as the occurrence of induced stellar wind in low-mass donors due to exposure to hard radiation from an accreting relativistic star. At the same time, the generally accepted assumption that donors of X-ray binaries fill their Roche lobes may not be fulfilled. A significant part of the donor’s wind matter may be lost from the system. In addition, radiation can enhance the stellar wind of the accretion disk, and part of this wind will also leave the system. There are other factors that reduce the total number of accreted matter: supernova explosions in X-ray binaries, destroying part of these systems, the impossibility of accretion onto rapidly rotating young neutron stars with a strong magnetic field, as well as a rapid drop in the rate of loss of matter by the donor as its mass decreases, characteristic for low-mass X-ray systems.

摘要 本文专门分析了银河系中X射线双星的演化状况。结果表明,假设这些双星系统保守演化,会导致银河系的X射线光度被高估3-4个数量级。观测到的X射线双星相对论成分对物质的总吸积率接近({sim} {{10}^{{ - 6}}{{M}_{ odot }} {{text/}})年,而理论上可能的吸积率达到({sim} {{10}^{{ - 2}}}{{M}_{ odot }} {{text/}})年。如果考虑到两个因素,这些估计值之间的矛盾就会消除。第一个因素是在大质量 X 射线双星系统中,在供体填充了罗切叶之后形成的共同包层,以及明亮 X 射线源的短暂阶段。共同包络消除了吸积过程中产生的 X 射线辐射输出,同时也导致系统中部分供体物质的流失。第二个因素是大质量 X 射线双星中的供体存在强烈的恒星风,以及低质量供体由于受到来自吸积相对论恒星的硬辐射而产生的诱导恒星风。同时,一般认为 X 射线双星的供体会填充其罗氏叶的假设可能并不成立。供体风物质的很大一部分可能会从系统中流失。此外,辐射会增强吸积盘的恒星风,而这部分风也会离开系统。还有其他一些因素会减少吸积物质的总数:X射线双星中的超新星爆炸会摧毁这些系统的一部分;不可能吸积到具有强磁场的快速旋转的年轻中子星上;以及随着供体质量的降低,其物质流失率会迅速下降,这是低质量X射线系统的特征。
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引用次数: 0
Determination of the Parameters of the Gravitational Field of the Earth by Gradiometric Measurements in the Earth’s Geocentric Coordinate System 在地球地心坐标系中通过梯度测量确定地球引力场参数
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-15 DOI: 10.1134/S1063772924700458
A. A. Kluykov

The article presents the results of determining the parameters of the Earth’s gravitational field by gradiometric measurements in the geocentric terrestrial coordinate system. The calculations were performed using the regularization method, according to which a regularization matrix multiplied by the regularization parameter is added to the matrix of normal equations. As a result of calculations for various regularization parameters, corrections to harmonic coefficients of degree and order were obtained 200 and 201, presented in the article in the form of graphs. Based on the obtained corrections, the power-law dispersions presented in Tables 1 and 2 were calculated.

摘要 文章介绍了在地心陆地坐标系中通过梯度测量确定地球重力场参数的结果。计算采用了正则化方法,即在正则方程矩阵中加入正则化矩阵乘以正则化参数。通过对各种正则化参数的计算,得到了对谐波系数的度和阶的修正值 200 和 201,并在文章中以图表的形式进行了介绍。根据得到的修正,计算出了表 1 和表 2 中的幂律离散度。
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引用次数: 0
Gas-Dynamical Model of Accretion on a Neutron Star with Viscosity and the Influence of Large-Scale Vortices on the Transmission of Angular Momentum 具有粘度的中子星上的吸积气体动力学模型以及大尺度漩涡对角动量传递的影响
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-15 DOI: 10.1134/S1063772924700422
A. G. Aksenov, V. M. Chechetkin

The work is devoted to the construction of a gas-dynamic model of the accretion disk around a neutron star (NS). The developed multidimensional code is used to study the stability of stationary axially symmetrical models by carry out of evolutionary calculations in 3D taking into account viscosity, as well as taking into account the diffusion of radiation in 2D. It is shown that an arbitrary stationary axially symmetrical disk with a monotonic decrease in density with a cylindrical radius transforms, due to viscosity, braking and spreading of matter along the NS, into a new quasi-stationary toroidal configuration. The stability study of the stationary toroidal configuration confirmed the formation of large-scale vortex structures at the initial periodic disturbance of angular velocity in azimuth, now taking into account the “turbulent” viscosity. It turned out that the presence of large-scale structures leads to an acceleration of braking, i.e., an effective increase in viscosity.

摘要 这项工作致力于构建中子星(NS)周围吸积盘的气体动力模型。所开发的多维代码用于研究静止轴对称模型的稳定性,方法是在三维中进行考虑到粘度的演化计算,以及在二维中考虑到辐射扩散。结果表明,由于粘度、制动和物质沿 NS 的扩散,一个密度单调下降、半径为圆柱形的任意静止轴对称圆盘会转变为一个新的准静止环形构型。对静止环形构型的稳定性研究证实,考虑到 "湍流 "粘度,在方位角角速度的初始周期性扰动时形成了大尺度涡旋结构。结果表明,大尺度结构的存在导致制动加速,即粘度的有效增加。
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引用次数: 0
V957 CEP—A Zero-Age Eclipsing System V957 CEP-A 零年龄食化系统
IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Pub Date : 2024-08-15 DOI: 10.1134/S1063772924700446
I. M. Volkov, S. A. Naroenkov, A. S. Kravtsova

New high-precision photometric measurements of the V957 Cep system ((P{{ = 1.99}^{d}}), (V{{ = 11.17}^{m}}), (e = 0.127), B6 V+B8 V), as well as an integrated approach to determining orbital parameters based both on photometric solutions of the light curves and the study of the course of residual deviations of the minima timings from the linear formula (O - C) made it possible for the first time to accurately measure the apsidal motion rate: ({{dot {omega }}_{{{text{obs}}}}} = 2.91^circ )/year, which coincided with the theoretical value under the condition of the orbital and axial rotation synchronism: ({{dot {omega }}_{{{text{theor}}}}} = 2.92^circ )/year. The physical parameters of the component stars were obtained: ({{T}_{1}} = 14,550 pm 300) K, ({{M}_{1}} = 4.0 pm 0.2{kern 1pt} {{M}_{ odot }}), ({{R}_{1}} = 2.55 pm 0.05{kern 1pt} {{R}_{ odot }}), ({{T}_{2}} = 12,400 pm 250) K, M2 = 3.0 ± (0.15{kern 1pt} {{M}_{ odot }}), ({{R}_{2}} = 1.88 pm 0.05{kern 1pt} {{R}_{ odot }}). This set of parameters corresponds to stars of zero age, recently descended to ZAMS. The secondary component is a pulsating variable star of the (beta ) Cephei type.

摘要对 V957 Cep 系统进行了新的高精度光度测量((P{{ = 1.99}^{d}}),(V{{ = 11.17}^{m}}),(e = 0.127), B6 V+B8 V),以及根据光曲线的光度解法和对极小时间与线性公式(O - C) 的残余偏差过程的研究来确定轨道参数的综合方法,使得精确测量空速运动速率成为可能:({{dot {omega }}_{{text{obs}}}}} = 2.91^circ)/year, 这与轨道和轴向自转同步条件下的理论值相吻合:{{dot {omega }}_{{text{theor}}}}} = 2.92^circ)/year.获得了各组成星的物理参数:K, ({{M}_{1}} = 4.0 pm 0.2{kern 1pt} {{M}_{ odot }}),({{R}_{1}} = 2.55 pm 0.05{kern 1pt} {{R}_{ odot }}), ({{T}_{2}} = 12,400 pm 250) K, M2 = 3.0 ± (0.15{kern 1pt} {{M}_{ odot }}),({{R}_{2}} = 1.88 pm 0.05{kern 1pt} {{R}_{ odot }}).这组参数对应的恒星年龄为零,最近才降到 ZAMS。次级成分是一颗(beta ) Cephei型的脉动变星。
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引用次数: 0
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