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A Simplified Approach to Kinematics of Stars in Solar Neighbourhood 太阳邻域恒星运动学的一种简化方法
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2015-12-01 DOI: 10.2298/SAJ150915005S
M. Stojanović
{"title":"A Simplified Approach to Kinematics of Stars in Solar Neighbourhood","authors":"M. Stojanović","doi":"10.2298/SAJ150915005S","DOIUrl":"https://doi.org/10.2298/SAJ150915005S","url":null,"abstract":"For a number of stars from the Solar neighbourhood the eccentricities of \u0000 their galactocentric orbits are calculated by using a simplified procedure \u0000 given by Ninkovic (2011). Eccentricities are calculated from the \u0000 three-dimensional orbits around the centre of the Milky Way for the same \u0000 sample of stars, by applying a model with the analytically given \u0000 gravitational potential as well. The orbital eccentricities (radial span of \u0000 each star) obtained in these two manners show a satisfactory agreement. It \u0000 can be concluded that for typical thin-disk stars the use of such a \u0000 simplified procedure, which requires much less computing time per star, in \u0000 determining their motion around the Galactic centre is justified. [Projekat \u0000 Ministarstva nauke Republike Srbije, br. ON176011: Kinematics and dynamics of \u0000 celestial bodies and systems]","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672632","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
Recoiling Black Holes in Static and Evolving Dark Matter Halo Potential 静态和演化暗物质晕势中的反冲黑洞
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2015-12-01 DOI: 10.2298/SAJ150706001S
M. Smole
{"title":"Recoiling Black Holes in Static and Evolving Dark Matter Halo Potential","authors":"M. Smole","doi":"10.2298/SAJ150706001S","DOIUrl":"https://doi.org/10.2298/SAJ150706001S","url":null,"abstract":"We follow trajectories of kicked black holes in static and evolving dark matter halo potential. We explore both NFW and Einasto dark matter density distributions. The considered dark matter halos represent hosts of massive spiral and elliptical field galaxies. We study the critical amplitude of kick velocity necessary for complete black hole ejection at various redshifts and find that ∼ 40% lower kick velocities can remove black holes from their host haloes at z = 7 compared to z = 1. The greatest difference between the static and evolving potential occurs near the critical velocity for black hole ejection and at high redshifts. When NFW and Einasto density distributions are compared ∼ 30% higher kick velocities are needed for complete removal of BHs from dark matter halo described by the NFW profile.","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672666","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: 2
On the Integrated Continuum Radio Spectrum of Supernova Remnant W44 (G34.7-0.4): New Insights From Planck 超新星遗迹W44 (G34.7-0.4)的综合连续无线电频谱:来自普朗克的新见解
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2015-05-12 DOI: 10.2298/SAJ150715004O
D. Onić
{"title":"On the Integrated Continuum Radio Spectrum of Supernova Remnant W44 (G34.7-0.4): New Insights From Planck","authors":"D. Onić","doi":"10.2298/SAJ150715004O","DOIUrl":"https://doi.org/10.2298/SAJ150715004O","url":null,"abstract":"In this paper, the integrated continuum radio spectrum of supernova remnant \u0000 (SNR) W44 was analyzed up to 70 GHz, testing the different emission models \u0000 that can be responsible for its particular shape. The observations by the \u0000 Planck space telescope made it possible to analyze the high frequency part of \u0000 radio emission from SNRs. Although the quality of radio continuum spectrum (a \u0000 high scatter of data points at same frequencies) prevents us to make definite \u0000 conclusions, the possibility of spinning dust emission detection towards this \u0000 remnant is emphasized. In addition, a concave-down feature, due to \u0000 synchrotron losses, can not be definitely dismissed by the present knowledge \u0000 of the integrated radio continuum spectrum of this SNR. [Projekat \u0000 Ministarstva nauke Republike Srbije, br. 176005: Emission Nebulae: Structure \u0000 and Evolution]","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2015-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672696","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: 4
Photometry and shape modeling of Mars crosser asteroid (1011) Laodamia 火星穿越小行星(1011)Laodamia的光度测定和形状建模
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2014-12-01 DOI: 10.2298/SAJ1489079A
G. Apostolovska, Z. Donchev, A. Kostov, V. Ivanova, G. Borisov, B. Bilkina
{"title":"Photometry and shape modeling of Mars crosser asteroid (1011) Laodamia","authors":"G. Apostolovska, Z. Donchev, A. Kostov, V. Ivanova, G. Borisov, B. Bilkina","doi":"10.2298/SAJ1489079A","DOIUrl":"https://doi.org/10.2298/SAJ1489079A","url":null,"abstract":"An analysis of photometric observations of Mars crosser asteroid 1011 \u0000 Laodamia conducted at Bulgarian National Astronomical Observatory Rozhen over \u0000 a twelve year interval (2002, 2003, 2004, 2006, 2007, 2008, 2011, 2012 and \u0000 2013) is made. Based on the obtained lightcurves the spin vector, sense of \u0000 rotation, and preliminary shape model of (1011) Laodamia have been determined \u0000 using the lightcurve inversion method. The aim of this investigation is to \u0000 increase the set of asteroids with known spin and shape parameters and to \u0000 contribute in improving the model in combination with other techniques and \u0000 sparse data produced by photometric asteroid surveys such as Pan-STARRS or \u0000 GAIA.","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672574","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: 1
FBILI METHOD FOR THE TWO-LEVEL ATOM LINE FORMATION IN MEDIA WITH LOW VELOCITY FIELDS 低速场介质中两能级原子线形成的Fbili方法
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2014-12-01 DOI: 10.2298/SAJ1489053P
I. Pirkovic, O. Atanacković
{"title":"FBILI METHOD FOR THE TWO-LEVEL ATOM LINE FORMATION IN MEDIA WITH LOW VELOCITY FIELDS","authors":"I. Pirkovic, O. Atanacković","doi":"10.2298/SAJ1489053P","DOIUrl":"https://doi.org/10.2298/SAJ1489053P","url":null,"abstract":"SUMMARY: In this paper we generalized the fast convergent Forth-and-Back Implicit Lambda Iteration (FBILI) method to the solution of the two-level atom line transfer problems in media with low velocity fields using the observer’s reference frame. In order to test the accuracy and the convergence properties of the method we solved several astrophysically important benchmark problems of the NLTE line formation: in a plan-parallel differentially expanding medium of finite thickness, and in spherically symmetric stellar atmospheres, both static and expanding. We compared our solutions with those obtained by other authors using different numerical methods.","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672452","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
Universal symbolic expression for radial distance of conic motion 圆锥运动径向距离的通用符号表达式
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2014-12-01 DOI: 10.2298/SAJ1489087S
M. Sharaf, A. S. Saad, A. Alshaery
{"title":"Universal symbolic expression for radial distance of conic motion","authors":"M. Sharaf, A. S. Saad, A. Alshaery","doi":"10.2298/SAJ1489087S","DOIUrl":"https://doi.org/10.2298/SAJ1489087S","url":null,"abstract":"SUMMARY: In the present paper, a universal symbolic expression for radial distance of conic motion in recursive power series form is developed. The importance of this analytical power series representation is that it is invariant under many operations because the result of addition, multiplication, exponentiation, integration, differentiation, etc. of a power series is also a power series. This is the fact that provides excellent flexibility in dealing with analytical, as well as computational developments of problems related to radial distance. For computational developments, a full recursive algorithm is developed for the series coefficients. An efficient method using the continued fraction theory is provided for series evolution, and two devices are proposed to secure the convergence when the time interval (t − t0) is large. In addition, the algorithm does not need the solution of Kepler’s equation and its variants for parabolic and hyperbolic orbits. Numerical applications of the algorithm are given for three orbits of different eccentricities; the results showed that it is accurate for any conic motion.","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672641","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: 1
The Effects of the Diurnal Atmospheric Variability on Entry, Descent and Landing on Mars 大气日变率对进入、下降和登陆火星的影响
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2014-12-01 DOI: 10.2298/SAJ1489069M
D. Marčeta
{"title":"The Effects of the Diurnal Atmospheric Variability on Entry, Descent and Landing on Mars","authors":"D. Marčeta","doi":"10.2298/SAJ1489069M","DOIUrl":"https://doi.org/10.2298/SAJ1489069M","url":null,"abstract":"Landing on Mars is extremely challenging task due to the fact that the \u0000 Martian atmosphere is the most hostile environment in the Solar system to \u0000 perform the entry, descent and landing (EDL) process, because it is thick \u0000 enough to create substantial heating of the entry vehicle but not thick \u0000 enough to reduce its velocity to the one necessary for safe landing. Beside \u0000 this, the atmosphere is very dynamic mainly due to high eccentricity of the \u0000 Martian orbit, obliquity of the orbital to the equatorial plane and close \u0000 alignment of the winter solstice and the orbital perihelion. Although \u0000 seasonal variations of atmospheric parameters are significantly larger than \u0000 the diurnal, it is very important to analyze diurnal cycles as they can \u0000 significantly change vertical and horizontal atmospheric profiles in very \u0000 short time intervals. This can present a serious threat to missions which \u0000 have very precise timings and specific requirements such as the requirement \u0000 for the daytime landing to enable ground images acquisition during the \u0000 descent and landing phase. A 3-degrees-of-freedom trajectory integration \u0000 routine was combined with the Mars Global Reference Atmospheric Model \u0000 (Mars-GRAM) to identify the dependence of the EDL profiles on the diurnal \u0000 cycles of atmospheric parameters throughout the Martian year. The obtained \u0000 results show that the influence of the diurnal cycles is the largest at the \u0000 equator and decreases relatively symmetrically towards the poles with a \u0000 slightly stronger influence in the northern hemisphere. Also, there is a \u0000 significant influence of the orbital position of Mars on the effect of \u0000 diurnal atmospheric variations which causes that, around the orbital \u0000 perihelion and winter solstice, there is some kind of inversion of the \u0000 dependance of optimal entry timing on latitude of the landing site comparing \u0000 to the rest of the Martian year. [Projekat Ministarstva nauke Republike \u0000 Srbije, br. 176002]","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672519","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: 1
Updated radio Σ - D relation for galactic supernova remnants - II 更新射电Σ - D关系银河超新星遗迹- II
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2014-11-09 DOI: 10.2298/SAJ1489025P
M. Pavlović, A. Dobardžić, B. Vukoti'c, D. Urošević
{"title":"Updated radio Σ - D relation for galactic supernova remnants - II","authors":"M. Pavlović, A. Dobardžić, B. Vukoti'c, D. Urošević","doi":"10.2298/SAJ1489025P","DOIUrl":"https://doi.org/10.2298/SAJ1489025P","url":null,"abstract":"In this paper we present the updated empirical radio surface-\u0000 brightness-to-diameter (?-D) relation for Galactic supernova remnants (SNRs)\u0000 calibrated using 110 SNRs with reliable distances. We apply orthogonal\u0000 fitting procedure and kernel density smoothing in the ? ? D plane and compare\u0000 the results with the latest theoretical ? - D relations derived from\u0000 simulations of radio evolution of SNRs. We argue that the best agreement\u0000 between the empirical and simulated ? ? D relations is achieved if the\u0000 mixed-morphology SNRs and SNRs of both, low brightness and small diameter,\u0000 are filtered out from the calibration sample. The distances to 5 newly\u0000 discovered remnants and 27 new candidates for shell SNRs are estimated from\u0000 our full and filtered calibration samples.","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2014-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672442","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: 31
Research of blazars at the Astronomical observatory of Belgrade 贝尔格莱德天文台对耀变体的研究
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2014-06-01 DOI: 10.2298/SAJ1488067V
O. Vince, G. Damljanovic
{"title":"Research of blazars at the Astronomical observatory of Belgrade","authors":"O. Vince, G. Damljanovic","doi":"10.2298/SAJ1488067V","DOIUrl":"https://doi.org/10.2298/SAJ1488067V","url":null,"abstract":"At the beginning of 2013, we have a team of scientists at the Astronomical \u0000 Observatory of Belgrade, focusing on observations and research of blazars. At \u0000 the same time, we established a cooperation with the Astronomical Observatory \u0000 of Torino (Osservatorio Astrofisico di Torino), center for the Whole Earth \u0000 Blazar Telescope (WEBT) international collaboration. In this paper, we \u0000 describe the WEBT project, present our equipment as well as some preliminary \u0000 results. We also point to some issues that we have encountered during the one \u0000 year experience and found important from the observational point of view. \u0000 [Projekat Ministarstva nauke Republike Srbije, br. 176011: Dynamics and \u0000 Kinematics of Celestial Bodies and Systems, br. 176021: Visible and Invisible \u0000 Matter in Nearby Galaxies: Theory and Observations i br. 176004: Stellar \u0000 Physics]","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2298/SAJ1488067V","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672361","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
LOW DARK MATTER CONTENT OF THE NEARBY EARLY-TYPE GALAXY NGC 821 附近早期星系ngc821的低暗物质含量
IF 0.5 4区 物理与天体物理
Serbian Astronomical Journal Pub Date : 2014-06-01 DOI: 10.2298/SAJ1488029S
S. Samurović, A. Vudragovic, M. Jovanović, M. Ćirković
{"title":"LOW DARK MATTER CONTENT OF THE NEARBY EARLY-TYPE GALAXY NGC 821","authors":"S. Samurović, A. Vudragovic, M. Jovanović, M. Ćirković","doi":"10.2298/SAJ1488029S","DOIUrl":"https://doi.org/10.2298/SAJ1488029S","url":null,"abstract":"In this paper we analyze the kinematics and dynamics of the nearby early-type \u0000 galaxy NGC 821 based on its globular clusters (GCs) and planetary nebulae \u0000 (PNe). We use PNe and GCs to extract the kinematics of NGC 821 which is then \u0000 used for the dynamical modelling based on the Jeans equation. We apply the \u0000 Jeans equation using the Newtonian mass-follows-light approach assuming \u0000 constant mass-to-light ratio and find that using such an approach we can \u0000 successfully fit the kinematic data. The inferred constant mass-to-light \u0000 ratio, 4:2 < M=LB < 12:4 present throughout the whole galaxy, implies the \u0000 lack of significant amount of dark matter. We also used three different MOND \u0000 approaches and found that we can fit the kinematic data without the need for \u0000 additional, dark, component. [Projekat Ministarstva nauke Republike Srbije, \u0000 br. 176021: Visible and invisible matter in nearby galaxies: theory and \u0000 observations]","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2298/SAJ1488029S","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68672185","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: 1
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