• Astron. Rep. (IF 1.164) Pub Date : 2020-10-10
M. M. Murzabekov, V. F. Fateev, P. A. Yuzefovich

Abstract The paper presents the component measurement results of plumb-line deviations (PLDs) with a digital astrometer at the Moscow gravitational anomaly (attraction). The anomaly was first discovered in the 1850s by B. Ya. Schweitzer, Professor of Astronomy of the Moscow University. The paper is based on the conference talk made at “Astronomy yesterday, today, tomorrow” (Sternberg Astronomical Institute

更新日期：2020-10-11
• Astron. Rep. (IF 1.164) Pub Date : 2020-10-10
L. A. Maksimova, Ya. N. Pavlyuchenkov, A. V. Tutukov

Abstract In this article, we proceed to study convection as a possible factor of episodic accretion in protoplanetary disks. Within the model presented in Article I, the accretion history is analyzed at different rates and areas of matter inflow from the envelope onto the disk. It is shown that the burst-like regime occurs in a wide range of parameters. The long-term evolution of the disk is also modeled

更新日期：2020-10-11
• Astron. Rep. (IF 1.164) Pub Date : 2020-10-10
N. T. Ashimbaeva, P. Colom, V. V. Krasnov, E. E. Lekht, M. I. Pashchenko, G. M. Rudnitskii, A. M. Tolmachev

Abstract We present the results of our observations of the star-forming region located in the Perseus arm and associated with the Sharpless nebula S231 in the lines of H2O at a wavelength of 1.35 cm and OH at a wavelength of 18 cm obtained with the Pushchino 22-m radio telescope (Russia) and the Nançay Large Radio Telescope (France), respectively. We provide a catalog of H2O maser spectra in the period

更新日期：2020-10-11
• Astron. Rep. (IF 1.164) Pub Date : 2020-10-10
V. A. Marsakov, V. V. Koval’, M. L. Gozha

Abstract The differences in the relationships between the physical parameters and the chemical-element abundances in accreted globular star clusters and those formed inside the Galaxy have been investigated. The information on the supposed formation sites of the clusters based on the Gaia DR2 data is borrowed from the literature. Those sources estimate the probability of belonging to the Galactic bulge

更新日期：2020-10-11
• Astron. Rep. (IF 1.164) Pub Date : 2020-10-10
A. V. Tutukov, M. D. Sizova, S. V. Vereshchagin

Abstract This paper presents a scenario of the evolution of OB associations and star clusters from formation to decay, in the process of which they turn into stellar streams moving in the disk and stellar “rings” around the galactic center. The scenario also includes the formation of stellar streams by galaxies absorbing their dwarf satellite galaxies. The simplest spatial kinematic models of evolution

更新日期：2020-10-11
• Astron. Rep. (IF 1.164) Pub Date : 2020-10-10
V. I. Shematovich, D. V. Bisikalo

Abstract— Model calculations of the charge exchange efficiency for solar wind protons colliding with hydrogen atoms of the extensive Martian corona are presented. It is shown that the energy spectrum of hydrogen atoms penetrating in the Martian atmosphere is identical to the spectrum of protons of the unperturbed solar wind. The charge exchange efficiency varies from 2 to 4% depending on the boundary

更新日期：2020-10-11
• Astron. Rep. (IF 1.164) Pub Date : 2020-10-10
A. S. Shibalova, V. N. Obridko, D. D. Sokolov, V. V. Pipin

Abstract The cyclic variations in the quadrupole component of the solar magnetic field is studied in tensor description. The results are consistent with the classical description of the quadrupole using spherical functions, and the mathematical apparatus of tensor algebra allows one to compare the observed changes in the magnetic quadrupole and the changes predicted by the dynamo theories. In conclusion

更新日期：2020-10-11
• Astron. Rep. (IF 1.164) Pub Date : 2020-10-10
B. P. Kondratyev, V. S. Kornoukhov

Abstract The problem of the secular evolution of a thin ring around a rapidly rotating triaxial celestial body is formulated and solved. The technology for calculating secular perturbations is based on two formulas: the azimuthally averaged force field of the central body and the mutual energy $${{W}_{{{\text{mut}}}}}$$ of this body and a Gaussian ring. With $${{W}_{{{\text{mut}}}}}$$ instead of the

更新日期：2020-10-11
• Astron. Rep. (IF 1.164) Pub Date : 2020-09-23
I. F. Malov, H. P. Marozava

Abstract— We have carried out a comparative analysis of the parameters of two samples of radio pulsars. The first of them is characterized by periods $$P > 2$$ s, the second one—by the surface magnetic fields $${{B}_{s}} > 4.4 \times$$ 1013 G. The purpose for selecting these values is for the understanding the origin of the difference between normal pulsars and anomalous X-ray pulsars (AXP) and gamma-repeaters

更新日期：2020-09-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-09-23
A. I. Neishtadt, G. S. Bisnovatyi-Kogan

Abstract The problem of the motion of two gravitating bodies in the presence of dark energy (DE), considered as a perturbing factor, is investigated. In addition to the orbit precession frequency obtained in previous studies, the correction to the orbital motion frequency was calculated, and the oscillations of the semi-major axis and the eccentricity of the orbit caused by the influence of DE were

更新日期：2020-09-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-09-23
A. O. Andreev, Yu. A. Nefedyev, N. Yu. Demina, L. A. Nefediev, N. K. Petrova, A. A. Zagidullin

Abstract The initial form of present-day space optical observations contain considerable geometrical and brightness distortions. This problem can be solved based on geometrical correction and transformation of reference object coordinates into commonly accepted cartographic projections. In this work, the method of coordinate transformation to the reference selenocentric dynamic system by using a base

更新日期：2020-09-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-09-23
T. N. Sannikova, K. V. Kholshevnikov

Abstract The motion of a point with zero mass under the action of attraction to the central body $$\mathcal{S}$$ and perturbing acceleration $${\mathbf{P}}{\kern 1pt} ' = {\mathbf{P}}{\text{/}}{{r}^{2}}$$, inversely proportional to the square of the distance to $$\mathcal{S}$$, is considered. It is assumed that $${\mathbf{P}}{\kern 1pt} '$$ is small in absolute value compared to the main acceleration

更新日期：2020-09-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-09-23
K. V. Kholshevnikov, D. V. Milanov, K. I. Os’kina, V. B. Titov

Abstract In order to solve the problem of deflecting a dangerous asteroid from a collision orbit with the Earth, using a low-thrust engine directed tangentially to the trajectory is considered. The engine can be mounted on the asteroid or on a “gravity tractor.” The purpose of this study is to establish the fundamental possibility of steering away an asteroid to a safe distance over times of approximately

更新日期：2020-09-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-09-23
M. K. Sharma, M. Sharma, S. Chandra

Abstract Though accurate laboratory studies of malononitrile (CH2(CN)2), a dinitrile molecule, have been carried out from time to time, and it has large electric dipole moment $$\mu = 3.735$$ D, its detection in a cosmic object is still awaited. Because of two equivalent hydrogen atoms, it has ortho and para species. In order to obtain information about some potential spectral lines of malononitrile

更新日期：2020-09-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-09-23
S. A. Sapozhnikov, D. A. Kovaleva, O. Yu. Malkov, A. Yu. Sytov

Abstract— We describe a homogeneous catalog compilation of common proper motion stars based on Gaia DR2. A preliminary list of all pairs of stars within the radius of 100 pc around the Sun with a separation less than a parsec was compiled. Also, a subset of comoving pairs, wide binary stars, was selected. The clusters and systems with multiplicity larger than 2 were excluded from consideration. The

更新日期：2020-09-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-08-31
I. V. Petrashkevich, A. F. Punanova, P. Caselli, J. Pineda, A. Pon, R. Friesen

Abstract Molecular clouds fragment to form dense cores, which are the first stage of star formation. Such objects are cold, with temperature of ~10 K and density of $${{10}^{4}}{-} {{10}^{7}}$$ cm–3, with predominance of thermal motions and high deuterium fraction. These objects give us information about the initial conditions of star formation and thus they are very important to understand this process

更新日期：2020-08-31
• Astron. Rep. (IF 1.164) Pub Date : 2020-08-31
V. A. Sokolova, A. I. Vasyunin, A. B. Ostrovskii, S. Yu. Parfenov

Abstract In this work we analyze the effect of gas-dust clumps, possibly formed in the interstellar medium due to instability, described in [10], on the chemical evolution of the diffuse interstellar medium. For this purpose we calculate chemical evolution with common parameters of diffuse interstellar medium (ISM). It is shown that abundances of most observed molecules are higher in a model of the

更新日期：2020-08-31
• Astron. Rep. (IF 1.164) Pub Date : 2020-08-31
A. Del Popolo

Abstract By using an extended spherical collapse model taking into account the effects of shear, vorticity, and dynamical friction we found the relationship between the turnaround radius, $${{R}_{t}}$$, and mass, $${{M}_{t}}$$, in $$\Lambda$$CDM and dark energy scenarios. We get a more general formula than that usually described in literature, showing a dependence of $${{R}_{t}}$$ from shear, vorticity

更新日期：2020-08-31
• Astron. Rep. (IF 1.164) Pub Date : 2020-08-31
V. M. Tomozov, S. A. Yazev, E. S. Isaeva

Abstract Strong flare events with an extended phase of gamma ray emission from the catalog by Share et al. have been analyzed in order to explain the characteristics of the impulsive and extended phases of such flares and reveal their connection with activity complexes and coronal holes. It is shown that 74% of such events are closely related to activity complexes. It has been qualitatively demonstrated

更新日期：2020-08-31
• Astron. Rep. (IF 1.164) Pub Date : 2020-08-31
A. V. Pynzar

Abstract Based on the spatial correlation between the distributions of diffuse ionized gas (DIG) and the HII regions in the Galaxy and using observations of the Galactic background in the H166α line found in literature, we investigated the strong inhomogeneity of the DIG in the direction of longitude 33.5° near the Galaxy plane, where objects located at close angular distances from each other have

更新日期：2020-08-31
• Astron. Rep. (IF 1.164) Pub Date : 2020-08-31
M. D. Sizova, S. V. Vereshchagin, B. M. Shustov, N. V. Chupina

Abstract The time and minimum distances of approaches were calculated more than 100 open star clusters (OSCs) near the Solar System over the past 5 Myr. It was shown that the closest proximity of the centers of the OSCs to the Solar System usually exceeded 60 pc. The Hyades cluster approached the Solar System at ~25 pc. The effect of such encounters on the comet motion in the outer regions of the Oort

更新日期：2020-08-31
• Astron. Rep. (IF 1.164) Pub Date : 2020-08-31
V. P. Ivanov, A. V. Ipatov, I. A. Rakhimov, T. S. Andreeva

Abstract Using the RT-32 radio telescope of the “Svetloe” IAA RAS observatory in 2017–2018, the flux density measurements of the combined (composite) supernova remnant (SNR) 3С396 (G39.2-0.3) at frequencies of 4840 and 8450 MHz are presented. The data obtained demonstrate source variability. Published data were used to determine the 3C396 flux density in 1962–2008 based on a comparison of the intensities

更新日期：2020-08-31
• Astron. Rep. (IF 1.164) Pub Date : 2020-08-31
V. A. Hagen-Thorn, D. A. Morozova, E. I. Hagen-Thorn, S. S. Savchenko, I. S. Troitsky, L. V. Shaliapina, E. V. Volkov

Abstract— The monitoring results of the blazar B1308+326 in the optical and radio bands in 2011–2018 are presented and analyzed. An optical flare of the object associated with the passage of revealed superluminal components through the radio core, coinciding in time with a γ-ray outburst, as well as outbursts at 43 GHz, were detected. The photometric variability is explained by a variable component

更新日期：2020-08-31
• Astron. Rep. (IF 1.164) Pub Date : 2020-08-31
V. P. Grinin, N. A. Katysheva, T. A. Ermolaeva, D. V. Dmitriev

Abstract The article considers the poorly studied states of hydrogen gas (called here “quasi-resonant”) with anomalously high intensity ratios of the lines in the Balmer series, $$I({{{\text{H}}}_{\alpha }}){\text{/}}I({{{\text{H}}}_{\beta }})$$. It is shown that such states arise in the case of large optical thicknesses of the emitting gas occurring at the frequencies of the Balmer lines, when the

更新日期：2020-08-31
• Astron. Rep. (IF 1.164) Pub Date : 2020-07-17
A. I. Khaliullina

Abstract The variations in the orbital period of the eclipsing binary system Z Per have been analyzed. It has been shown that the variations in the period can be represented as a superposition of the secular decrease in the period at a rate of 1.61 × 10–6 days/year and its three cyclic variations with periods of 22.6, 37.9, and 62.4 years. Z Per is most likely a quadruple system with periods of additional

更新日期：2020-07-17
• Astron. Rep. (IF 1.164) Pub Date : 2020-07-17
A. G. Zhilkin, D. V. Bisikalo

Abstract—For the case of the sub-Alfvén regime of the stellar wind flyby around the planet, the flow structure in the vicinity of a hot Jupiter have been studied by three-dimensional numerical simulation. As an example, the hot Jupiter HD 209458b was considered. The planet’s magnetic moment was set equal to 10% of the magnetic moment of Jupiter. The average magnetic field at the parent star’s surface

更新日期：2020-07-17
• Astron. Rep. (IF 1.164) Pub Date : 2020-07-17
A. P. Glushak

Abstract—The distribution of young pulsars in the log(dP/dt)–log(tc) diagram that have a characteristic age tc < ~5 × 106 yr and a period derivative dP/dt > ~10–16 is analyzed. Six clusters-stripes are revealed for the first time, along which the long-term evolution tracks of individual pulsars pass. The mean track in a stripe corresponds to the long-term regular evolution for a typical pulsar of this

更新日期：2020-07-17
• Astron. Rep. (IF 1.164) Pub Date : 2020-07-17
M. K. Abubekerov, N. Yu. Gostev

Abstract The interpretation of high-precision transit light curves of binary systems with exoplanets Kepler-5b, Kepler-6b, and Kepler-7b is performed for three different epochs. It has been demonstrated that the values of the stellar limb-darkening coefficients differ significantly for each epoch, while the geometric parameters for each epoch agree well with each other within the error margin. It is

更新日期：2020-07-17
• Astron. Rep. (IF 1.164) Pub Date : 2020-07-17
E. V. Mikheeva, S. V. Repin, V. N. Lukash

Abstract The study explores black hole (BH) shadow images which can be restored by data processing and image recovery procedures during space Very Large Baseline Interferometry (VLBI) missions in the future. For Kerr BHs with masses and coordinates of SgrA*, M87*, and M31*, all illuminated by a light source behind them, three kinds of observation are considered: the ground-based interferometer (similar

更新日期：2020-07-17
• Astron. Rep. (IF 1.164) Pub Date : 2020-07-17
N. T. Ashimbaeva, P. Colom, V. V. Krasnov, E. E. Lekht, M. I. Pashchenko, G. M. Rudnitskii, A. M. Tolmachev

Abstract We present the observation results of the star forming region NGC 2071 in the 1.35-cm H2O line and 18-cm OH lines obtained with the 22-m radio telescope in Pushchino (Russia) and the large radio telescope in Nançay (France), respectively. The catalog of H2O maser emission spectra from December 2010 to January 2020 is given. The total flux variability for the entire monitoring period (1979–2020)

更新日期：2020-07-17
• Astron. Rep. (IF 1.164) Pub Date : 2020-07-17
V. I. Shematovich, E. S. Kalinicheva

Abstract We present the model calculation results of the atomic oxygen loss rate from the Martian atmosphere induced by precipitation of high-energy protons and hydrogen atoms (H/H+) from the solar wind plasma. Penetration of energetic protons and hydrogen atoms from the solar wind plasma to the upper atmosphere of Mars at altitudes of 100−250 km is accompanied by the momentum and energy transfer in

更新日期：2020-07-17
• Astron. Rep. (IF 1.164) Pub Date : 2020-07-17
A. Del Popolo

Abstract In this paper, we check the claim of dependence of the halo density profile on the ratio between stellar and halo mass. Namely, we want to continue the work done in a previous paper by Del Popolo (2015), to see to what extent the SN feedback scenario is able to describe the inner structure of galaxies, employing more sophisticated statistical tools than those indicated in the quoted paper

更新日期：2020-07-17
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-16
A. E. Rodin, V. V. Oreshko, V. A. Potapov, M. S. Pshirkov, M. V. Sazhin

Abstract The paper considers the principles of space navigation using pulsars observed in the radio range. The requirements for receiving equipment are outlined, a recommended pulsar list is given, and an algorithm for determining the position of a spacecraft in barycentric coordinates and calculating corrections to the onboard time scale is described.

更新日期：2020-06-16
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-16
A. V. Sobolev, A. G. Zhilkin, D. V. Bisikalo, D. A. H. Buckley

The flow structure in the asynchronous polar CD Ind was investigated in the approximation of an offset dipole. Computation results made it possible to identify such system features as the drift of hot spots over the white dwarf surface, the flow structure dependence on the phase of the beat period, and the magnetic pole switching. To study the flow structure, a three-dimensional numerical MHD model

更新日期：2020-06-16
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-16
V. S. Bychkova, N. S. Kardashev, K. L. Maslennikov, V. L. Plokhotnichenko, G. M. Beskin, S. V. Karpov

Abstract— The results of polarimetric observations of blazar S5 0716+714, carried out with the 6-meter BTA telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences, are presented. The polarized emission microvariability of blazar S5 0716+714 was observed in the R band with an initial time resolution of 3–5 seconds. Exposures were integrated at 1-minute intervals with a

更新日期：2020-06-16
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-16
A. V. Borovik, A. V. Mordvinov, E. M. Golubeva, A. A. Zhdanov

Abstract The development of the solar magnetic activity in cycle 24 has been analyzed. It has been shown that the significant north–south asymmetry of magnetic activity was accompanied by the asynchronous reorganization of solar magnetic fields in the northern and southern hemispheres. The formation of unipolar magnetic regions after the decay of activity centers has been studied. The meridional transport

更新日期：2020-06-16
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-16
S. A. Tyul’bashev, M. A. Kitaeva, V. S. Tyul’bashev, V. M. Malofeev, G. E. Tyul’basheva

Abstract During five years of daily observations, the search for new pulsars using the BSA LPI radio telescope in 96 spatial beams covering 17 000 square degrees was conducted. Five new pulsars were identified. Candidate pulsars were selected in summed power spectra. A noise generator was used to renormalize data and total the power spectra for individual directions correctly. As a result, the sensitivity

更新日期：2020-06-16
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-05
B. P. Kondratyev, V. S. Kornoukhov

Abstract A new approach to the study of long-period and secular perturbations in celestial mechanics is developed. In contrast to the traditional use of the apparatus of the perturbing Lagrange function, we rely on the mutual potential energy of elliptic Gaussian rings. This approach is important due to the fact that instead of averaging the expression for the perturbing Lagrange function obtained

更新日期：2020-06-05
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-05
V. K. Milyukov, I. Yu. Vlasov, M. V. Sazhin, O. S. Sazhina, V. N. Sementsov

Abstract— The theory of relativistic reductions for future challenges of space gravimetry with target accuracy of up to 1 picometer is developed in this paper.

更新日期：2020-06-05
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-05
O. L. Ryabukhina, M. S. Kirsanova

Abstract— We report observations of molecular line emission toward dense clumps of the WB 673 interstellar filament: WB 668, WB 673, S233–IR, and G173.57+2.43. The observations were done with the 20-m telescope at the Onsala Space Observatory (Sweden). Maps of emission, column densities, and relative abundances of CO, N2H$$^{ + }$$, CS, HCN, and HNC molecules are presented. It was found that the molecular

更新日期：2020-06-05
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-05
A. Vasylenko, E. Fedorova, A. Del Popolo

Abstract We analyze all the available X-ray data in order to monitor the narrow-line Seyfert 1 galaxy NGC 4748, namely XMM-Newton (EPIC and OM), INTEGRAL (ISGRI and JEM-X), and SWIFT (BAT and XRT) data to study both the wide-band 0.5–195 keV spectrum and light curves in details. To this aim, we use the autocorrelation analysis of the light curves, modeling the spectra with several physically-conditioned

更新日期：2020-06-05
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-05
M. V. Sergienko, M. G. Sokolova, K. V. Kholshevnikov

Abstract The results of the search for Apollo, Amor, and Aten asteroids with the orbits close to those of meteoroids of the δ-Cancrids meteor complex (code DCA), which consists of the northern (code NCC) and southern (code SCC) branches, are presented. The search for small bodies in close orbits was performed on the basis of a multifactorial method of combining several criteria: Drummond orbital similarity

更新日期：2020-06-05
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-05
S. V. Chernov

The variation of the orbital periods found in high-mass X-ray binaries occurring over time can be explained by two models. According to the first model, orbital decay occurs due to dynamic tidal forces. The second model shows that the change occurs due to the inertia moments of a massive star during its evolution. These models are applied to LMC X-4 and Cen X-3.

更新日期：2020-06-05
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-05
S. A. Tyul’bashev, I. V. Chashei, I. A. Subaev, M. A. Kitaeva

Abstract The search for compact components of strong ($${{S}_{{{\text{int}}}}} \geqslant 5$$ Jy at 102.5 MHz) discrete radio sources from the Pushchino catalogue was carried out using the method of interplanetary scintillation. A total of 3620 sources were examined, and 812 of them were found to harbor compact (scintillating) components. Estimates of fluctuations of the flux density of these compact

更新日期：2020-06-05
• Astron. Rep. (IF 1.164) Pub Date : 2020-06-05
A. S. Gusev, F. Kh. Sakhibov, O. V. Ezhkova

We present results of the analysis of photometric and spectroscopic observations of the young stellar complexes in the late giant spiral galaxy UGC 11973. Photometric analysis in the $$UBVRI$$ bands have been carried out for the 13 largest complexes. For one of them, metallicity of the surrounding gas $$Z = 0.013 \pm 0.005$$, the mass $$M = (4.6 \pm 1.6) \times {{10}^{6}}{\kern 1pt} {{M}_{ \odot }}$$

更新日期：2020-06-05
• Astron. Rep. (IF 1.164) Pub Date : 2020-04-14
L. N. Berdnikov, A. A. Belinskii, N. I. Shatskii, M. A. Burlak, N. P. Ikonnikova, E. O. Mishin, D. V. Cheryasov, S. V. Zhuiko

Abstract For the first time, BVIc observations of the Cepheid V811 Oph were obtained by using a new 60‑cm telescope at the Caucasus Mountain Observatory, Sternberg Astronomical Institute, Moscow State University (SAI MSU). An $$O{-}C$$ diagram covering a time span of 124 years was plotted using photometry from old photographic and modern sky surveys. The diagram has a parabola shape, which made it

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-04-14
V. V. Bobylev, A. T. Baykova

Abstract The kinematic properties of the Scorpius–Centaurus association were studied using spatial velocities of approximately 700 young T Tauri stars. Their proper motions and trigonometric parallaxes were selected by Zari et al. from the Gaia DR2 catalog, and radial velocities were taken from various sources. The linear expansion coefficient’s new estimate of the association $$K = 39 \pm 2$$ km/s/kpc

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-04-14
A. A. Chelpanov, N. I. Kobanov

Abstract— We applied a new approach to measure the time delays of magnetohydrodynamic waves propagating in the solar atmosphere. A small flare in the flare region of the chromosphere served as a modulator of 3‑ and 5-minute oscillations. The oscillation amplitude increased several times, which made it possible to easily fix the wave train formed as it spread upward through the solar atmosphere layers

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-04-14
K. V. Kholshevnikov, N. Batmunkh, K. I. Oskina, V. B. Titov

Abstract— The averaging method is widely used in celestial mechanics, in which a mean orbit is introduced and slightly deviates from an osculating one, as long as disturbing forces are small. The difference $$\delta {\mathbf{r}}$$ in the celestial body positions in the mean and osculating orbits is a quasi-periodic function of time. Estimating the norm $$\left\| {\delta {\mathbf{r}}} \right\|$$ for

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-04-14
S. F. Rahman

Abstract This paper constraints dynamic dark energy equation of state (EoS) parameters using the type Ia supernovae from Union 2.1 dataset. The paper also discusses the dependency of dynamic dark energy EoS parameters on the chosen or assumed value of the Hubble Constant. To understand the correlation between the Hubble Constant values and measured dynamic dark energy EoS parameters, we used recent

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-04-14
V. N. Varakin, M. S. Murga

Abstract— Astronomical observations indicate a high abundance of methanol molecules in the gas phase of molecular-cloud dense cores, which cannot be explained by gas-phase chemical reactions only. A significant contribution to the methanol abundance should be provided by chemical reactions on the dust particle surface with subsequent desorption of the produced molecules into the gas phase. For the

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-04-14
D. I. Zobnina, A. V. Zasov

Abstract A sample of 22 spiral galaxies compiled from published data is studied. The galaxy rotation curves pass through a maximum distance of more than ~1 kpc from the center with a subsequent decrease in the rotation velocity. The galaxy position in the Tully–Fisher (TF) and baryonic Tully–Fisher (BTF) diagrams show that the maximum rotation velocities are located on the same sequence with other

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-04-14
L. V. Tambovtseva, A. Kreplin, V. P. Grinin, G. Weigelt

Abstract Modeling of hydrogen emission lines is a powerful tool to study physical processes in the nearest vicinity of young stars because spectral lines carry information on the kinematics and physical conditions of the gas. One of the lines that probe emitting regions closest to the star is the Br$$\gamma$$ line. We consider different types of hybrid models to reproduce both interferometric VLTI-AMBER

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-04-14
M. A. Kharinov, V. K. Konnikova, A. V. Ipatov, I. A. Ipatova, A. K. Erkenov

Abstract The presented observation results of the blazar J0238+1636 were obtained in: 2014–2019 with the RATAN-600 radio telescope from the Special Astrophysical Observatory of the Russian Academy of Sciences at 2.3, 4.8, 8.2, 11.2, and 21.7 GHz; and 2015–2017 with the 32-m Zelenchuk and Badary radio telescopes of the Institute of Applied Astronomy of the Russian Academy of Sciences at 4.84 and 8.57

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-03-31
I. A. Kondratyev, S. G. Moiseenko, G. S. Bisnovatyi-Kogan, M. V. Glushikhina

Abstract— The results of three-dimensional numerical simulation of heat transfer in the outer layers of magnetized neutron stars are presented. Determining the structure of the magnetic field on a neutron star surface is an important task of modern astrophysics. In the presence of strong magnetic fields, the medium becomes anisotropic, and the laws of heat conduction change. The tensor coefficient

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-03-31
I. M. Volkov, A. S. Kravtsova

Abstract We present the first high accuracy UBVRI(RI)c CCD light curves of the newly discovered eclipsing system PS UMa = GSC 4375 1733 ($$P = 9_{·}^{d}27$$, $$V = 12_{·}^{m}42$$). The photometric solutions are found, the physical parameters of the components are derived. The eccentricity of the orbit was found to be negligible e = 0.074, which made it difficult to measure the rate of the apsidal rotation

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-03-31
B. P. Filippov

Abstract Solar filaments (prominences), which suddenly and swiftly ascend, i.e., become eruptive, sometimes decelerate and stop at comparatively low altitudes. Causes of failed eruptions generally remain uncertain. The present study analyzes two eruptive phenomena with very similar initial geometries and configurations of external magnetic fields; one of these eruptions evolves in a coronal mass ejection

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-03-31
R. R. Andreasyan, E. A. Mikhailov, H. R. Andreasyan

Abstract At the present time, the induction of several microgauss in large-scale fields of the Galaxy has been repeatedly confirmed. There are numerous arguments in favor of the fact that the magnetic field exhibits so-called reversals associated with a direction change from one region to another. Such configurations are allowed in the nonlinear equations context of the dynamo theory, which describes

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-03-31
A. G. Zhilkin, D. V. Bisikalo, P. V. Kaygorodov

Abstract The orientation parameter effect of a hot Jupiter’s intrinsic dipole magnetic field on the flow structure in an extended gaseous (ionospheric) envelope of the planet is studied with a three-dimensional numerical simulation. For example, the hot Jupiter HD 209458b is considered. The magnitude of the planet’s magnetic momentum was set equal to 0.1 of the magnetic momentum of Jupiter. The parameters

更新日期：2020-04-23
• Astron. Rep. (IF 1.164) Pub Date : 2020-03-31
E. A. Trofimova, I. I. Zinchenko, P. M. Zemlyanukha, M. Thomasson

Abstract A survey of massive star forming regions in the lines of the lowest transitions of deuterated molecules DCN, DNC, DCO+, N2D+ in the 4 mm wavelength range was performed using the 20 m radio telescope of the Onsala Space Observatory. A total of about 60 sources was observed. Lines of the DCN, DNC, and DCO+ molecules are registered in about a third of them, lines of the N2D+ molecule only in

更新日期：2020-04-23
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