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Dynamical investigation of the multiple star ADS 9173 AB ADS 9173 AB多星的动力学研究
Publications of the Pulkovo Observatory Pub Date : 2023-07-31 DOI: 10.31725/0367-7966-2023-229-4
O. Kiyaeva, I. Izmailov, N. Narizhnaya, L. G. Romanenko
{"title":"Dynamical investigation of the multiple star ADS 9173 AB","authors":"O. Kiyaeva, I. Izmailov, N. Narizhnaya, L. G. Romanenko","doi":"10.31725/0367-7966-2023-229-4","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-229-4","url":null,"abstract":"Star ADS 9173=WDS 14135+5147=Hip 69483 is a complex system. The B component has a spectroscopic companion, whose orbit with a period of 4.9 years has been known since 1986. The Gaia telescope has detected a distant faint pair over 100\" away from the bright AB pair. In our article, we study the movement in a bright pair based on long-term observations with the 26-inch refractor of the Pulkovo Observatory. The AB pair orbit with a period of 6306 years was calculated using the apparent motion parameters (AMP) method. The astrometric orbit of the component B was determined on the basis of the residuals of the homogeneous CCD observations up to 2023 with the 26-inch refractor. It is in agreement with the spectroscopic one. The remaining secondary residuals show a wave with a period of approximately 20 years, the reasons for which are discussed.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128699330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Globular clusters captured by the Milky Way’s bar 被银河系的横条捕获的球状星团
Publications of the Pulkovo Observatory Pub Date : 2023-05-01 DOI: 10.31725/0367-7966-2023-228-12
A. Smirnov, A. Bajkova, V. Bobylev
{"title":"Globular clusters captured by the Milky Way’s bar","authors":"A. Smirnov, A. Bajkova, V. Bobylev","doi":"10.31725/0367-7966-2023-228-12","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-12","url":null,"abstract":"Equations of motion are integrated backwards in time by 5 Gyr for thirty globular clusters from the central parts of the Milky Way. We considered two models of the potential, one, which is obtained by fitting the velocity curve of the Milky Way, and the second one, which is based on the results of N-body simulations. Obtained orbits were studied within the approach of spectral dynamics: main frequency of oscillations fx and fR were calculated for each of the orbits. Our analysis showed that six of the studied gloubular clusters (NGC 6266, NGC 6642, Terzan 1, Terzan 2, Terzan 4, and Terzan 5) have frequencies ratios fR/fx ≈ 2, that is, they can support the bar in the considered models.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124298549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The most interesting results of the study of the Galaxy by OB stars 这是OB星对银河系研究中最有趣的结果
Publications of the Pulkovo Observatory Pub Date : 2023-05-01 DOI: 10.31725/0367-7966-2023-228-4
V. Bobylev, A. Bajkova
{"title":"The most interesting results of the study of the Galaxy by OB stars","authors":"V. Bobylev, A. Bajkova","doi":"10.31725/0367-7966-2023-228-4","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-4","url":null,"abstract":"A review of the main results of studying the structure and kinematics of the Galaxy obtained by various research teams using OB stars is given. The main attention is paid to the results of the authors of this work. The following questions are considered: a) the nature of the spatial distribution of OB stars in the Galaxy; b) the use of OB stars to refine the parameters of the spiral pattern of the Galaxy; c) refinement of the Galactic rotation parameters and perturbation velocities caused by the influence of the Galactic spiral density wave using OB stars; d) spatial and kinematic relationship of OB stars with galactic warp; e) analysis of the motion of some runaway OB stars.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"348 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122333849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of the structure and kinematics of the Galaxy by open star clusters and associations in the Gaia era 盖亚时代疏散星团和星团对银河系结构和运动学的研究
Publications of the Pulkovo Observatory Pub Date : 2023-05-01 DOI: 10.31725/0367-7966-2023-228-5
V. Bobylev, A. Bajkova
{"title":"Study of the structure and kinematics of the Galaxy by open star clusters and associations in the Gaia era","authors":"V. Bobylev, A. Bajkova","doi":"10.31725/0367-7966-2023-228-5","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-5","url":null,"abstract":"This article is a review, written on the basis of previously published results. It examines the main kinematic and spatial properties of the open star clusters (OCs) of the Galaxy. The results of determining the parameters of galactic rotation are described, which are obtained using the most up-to-date kinematic data on stars. Obtained, in particular, according to the Gaia DR2 and Gaia EDR3 catalogs. The results of the analysis of the residual, freed from the influence of the peculiar motion of the Sun and the rotation of the Galaxy, the velocities of the OCs are reflected. It is described about the manifestation of the galactic spiral density wave in the residual velocities of the OCs. The results of various authors are described, who have found out i) how the variance of the residual velocities of the OCs depends on their age, ii) what are the dispersions of the velocities of OB associations and their structural components, iii) what are the dispersions of the residual velocities of stars inside the OCs themselves.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"26-27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132361465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Globular clusters in the central region of the Milky way galaxy. I. Bar influence on the orbit parameters according to Gaia EDR3 银河系中心区域的球状星团。根据盖亚EDR3, Bar对轨道参数的影响
Publications of the Pulkovo Observatory Pub Date : 2023-05-01 DOI: 10.31725/0367-7966-2023-228-1
A. Bajkova, A. Smirnov, V. Bobylev
{"title":"Globular clusters in the central region of the Milky way galaxy. I. Bar influence on the orbit parameters according to Gaia EDR3","authors":"A. Bajkova, A. Smirnov, V. Bobylev","doi":"10.31725/0367-7966-2023-228-1","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-1","url":null,"abstract":"The work is devoted to the analysis of the influence of the galactic bar on the orbital motion of globular clusters in the central region of the Galaxy. For this task, 45 globular clusters were selected, 34 of which belong to the bulge and 11 to the disk. The most accurate astrometric data from the Gaia satellite (Vasiliev and Baumgardt, 2021), as well as new refined average distances (Baumgardt and Vasiliev, 2021), were used to form the 6D phase space required for orbit integration. The orbits of globular clusters are obtained both in an axisymmetric potential and in a potential including a bar. In this case, the mass, rotation speed, shape and scale length of the bar were varied. A comparison is made of such orbital parameters as apocentric and pericentric distances, eccentricity and maximum distance from the galactic plane. It is shown that the mass of the bar exerts the greatest influence on the orbital motion, which is expressed mainly in an increase in both the apocentric and pericentric distances in the vast majority of globular clusters. The eccentricities of the orbits in the overwhelming majority also change significantly, and there is a change both upward and downward, especially in the range of values from 0.2 to 0.8. The greatest changes in parameters are observed in globular clusters with high radial velocities and small pericentric distances. The change in orbital parameters depending on the bar rotation speed is less pronounced. The influence of the geometric parameters of the bar is insignificant in the accepted range of their changes. Several examples show that globular clusters in the bulge are more affected by the bar than those belonging to the disk.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132176596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Deceleration of the disk by the accreting magnetized star in the corotation approximation 在自转近似中，吸积磁化恒星对圆盘的减速
Publications of the Pulkovo Observatory Pub Date : 2023-05-01 DOI: 10.31725/0367-7966-2023-228-6
N. Ikhsanov, N. Beskrovnaya
{"title":"Deceleration of the disk by the accreting magnetized star in the corotation approximation","authors":"N. Ikhsanov, N. Beskrovnaya","doi":"10.31725/0367-7966-2023-228-6","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-6","url":null,"abstract":"We analyze the process of interaction of the viscous keplerian accretion disk with the dipole magnetic field of the accretor within the corotation approximation. We estimate the radial dependence of the gaseous pressure in such non-magnetized accretion disk. We calculate the equilibrium radius at which the gaseous pressure in the disk is balanced by the pressure of the dipole magnetic field of the accreting star. We show that this radius depends on the disk viscosity and is significantly smaller than the canonical Alfvén radius realized in the process of spherical accretion.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133053392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Review of current estimates of the Galaxy mass 对当前银河系质量估计的回顾
Publications of the Pulkovo Observatory Pub Date : 2023-05-01 DOI: 10.31725/0367-7966-2023-228-3
V. Bobylev, A. Bajkova
{"title":"Review of current estimates of the Galaxy mass","authors":"V. Bobylev, A. Bajkova","doi":"10.31725/0367-7966-2023-228-3","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-3","url":null,"abstract":"An overview of the methods used to estimate the mass of the Galaxy and the results obtained by various authors recently according to modern data is given. In particular, the estimates obtained based on the analysis of the galactic rotation curve, on the kinematics of the Galactic dwarf satellites and globular clusters, on the streams of such dwarf galaxies, on escape speed, as well as on halo stars are considered. Estimates of the Galaxy mass in the form $M (<r)$, $M_{rm 200}$ and $M_{rm vir}$ are considered. According to 20 individual estimates, the average value was found $overline M_{rm 200}=0.88times 10^{12}~M_odot$ with a dispersion of $0.24times 10^{12}~M_odot$ and a weighted average error of $0.06times 10^{12}~M_odot$. According to 25 individual estimates, $overline M_{rm vir}=1.02times10^{12}~M_odot$ was obtained with a dispersion of $0.41times 10^{12}~M_odot$ and a weighted average error of $0.09times10^{12}~M_odot$.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121682769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
To use the new sphere pixelization method SREAG 采用新的球面像素化方法SREAG
Publications of the Pulkovo Observatory Pub Date : 2023-05-01 DOI: 10.31725/0367-7966-2023-228-10
Z. Malkin
{"title":"To use the new sphere pixelization method SREAG","authors":"Z. Malkin","doi":"10.31725/0367-7966-2023-228-10","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-10","url":null,"abstract":"A new method SREAG (Spherical Rectangular Equal-Area Grid) was proposed in Malkin (2019) to divide a spherical surface into rectangular cells of equal area. SREAG grid consists of a set of rings parallel to the equator, and each ring is divided into several cells, the number of which depends on the mean latitude of the ring. This paper presents some SREAG features in more details. The minimum number of rings is four. The maximum number of SREAG rings that can be achieved when using a 32-bit integer is 41068, which corresponds to the full range of resolution from $sim$45$^{circ}$ to $sim$16$''$ The computational accuracy of SREAG is also estimated. Simple expressions were derived to calculate the basic SREAG parameter, number of rings, for the desired number of cells or for the required grid resolution.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134016979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The outer orbit of the triple star T Tauri 三颗恒星金牛座T的外层轨道
Publications of the Pulkovo Observatory Pub Date : 2023-05-01 DOI: 10.31725/0367-7966-2023-228-8
O. Kiyaeva, L. G. Romanenko
{"title":"The outer orbit of the triple star T Tauri","authors":"O. Kiyaeva, L. G. Romanenko","doi":"10.31725/0367-7966-2023-228-8","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-8","url":null,"abstract":"The T Tauri's triple system of young stars (WDS 04220+1932=Hip 20390) was discovered in 1983. Since that time, a lot of articles are devoted to the study of the physical properties of the stars of this system. Our work is dedicated to astrometric study of this triple system using the apparent motion parameters (AMP) method. The orbit of the inner pair $ SaSb $ with a period of 27 years is now well known citep{schef20}. The total mass $M_{Sa+Sb}=2.49 M_odot$ if to use parallax from Gaia DR3 citep{G2022}. Two orbits of the outer pair N-S are obtained on the basis of published high-precision homogeneous observations on the Keck~1 and VLT telescopes, and one of them is almost circular orbit. For a circular orbit, orbital elements and dynamic parallax can be calculated for a given mass using only apparent motion parameters. This is what made it possible to compare dynamic parallax with high-precision one from the Gaia DR3 catalog and to calculate the components masses depending on the mass of the internal subsystem: $M_{N}=2.4pm 0.2~M_odot$, $M_{Sa}=2.09pm 0.05~M_odot$, $M_{Sb}=0.40pm 0.05~M_odot$. Limits for the orbital period are also estimated: $500leq {P}leq {700}$ ~ years.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121822845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of the structure and kinematics of the Galaxy based on data on classical Cepheids 基于经典造父变星数据的银河系结构和运动学研究
Publications of the Pulkovo Observatory Pub Date : 2023-05-01 DOI: 10.31725/0367-7966-2023-228-2
V. Bobylev, A. Bajkova
{"title":"Study of the structure and kinematics of the Galaxy based on data on classical Cepheids","authors":"V. Bobylev, A. Bajkova","doi":"10.31725/0367-7966-2023-228-2","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-2","url":null,"abstract":"Classical Cepheids are important for studying the properties of the galactic disk, the spiral structure of the Galaxy, its rotation, evolution, etc. This article provides an overview of the main results of studying the structure and kinematics of the Galaxy, which were obtained by various scientific teams using classical Cepheids. The main attention is paid to the results of studying the Galaxy obtained by the authors of this work. The following issues are considered: a) the nature of the spatial distribution of Cepheids in the Galaxy, both near the equatorial plane of the Galaxy and in the vertical direction; in particular, the relationship of Cepheids with the large-scale Warp of the galactic disk is considered; b) the use of young Cepheids to refine the parameters of the spiral pattern of the Galaxy; c) the use of young Cepheids to refine the rotation parameters Galaxies and perturbation velocities caused by the influence of the galactic spiral density wave.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114219608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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