Astrophysics最新文献

{"title":"Ultrafast Variability of Line Profiles in Spectra of γ Ori","authors":"A. F. Kholtygin,&nbsp;V. B. Puzin,&nbsp;I. V. Sokolov,&nbsp;M. S. Kurdoyakova","doi":"10.1007/s10511-023-09769-z","DOIUrl":"10.1007/s10511-023-09769-z","url":null,"abstract":"<div><div><p>High time-resolution (∆T~2 min) observations of the B2V star γ Ori on the 2-m telescope at the Terskol Peak Observatory are presented. Regular components of line profile variations with periods from ~57 min to ~130 min are recorded. The nature of these variations is discussed.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"66 1","pages":"37 - 51"},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4784419","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}

{"title":"Effect of the Interaction Between Hyperons on the Moment of Inertia of the Proto Neutron Stars","authors":"Xian-Feng Zhao","doi":"10.1007/s10511-023-09772-4","DOIUrl":"10.1007/s10511-023-09772-4","url":null,"abstract":"<div><div><p>Effect of the interaction between hyperons on the moment of inertia of proto neutron stars (PNSs) PSR J0740+6620, PSR J0348+0432, PSR J1614-2230 and PSR J0737-3039A is examined by means of relativistic mean field theory. Taking into account the interaction between hyperons, the mass M of the PNS decreases with respect to the same radius R, the energy density ε increases with respect to the same pressure p, and the moment of inertia I of the PNS decreases with respect to the same central energy density ε_c . Under the constraint of the mass of the PNS, considering the interaction between hyperons, the larger the mass of the PNS, the more the radius and moment of inertia of the PNS decrease, while the more energy density and pressure increase. For smaller PNSs, the effect can be negligible.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"66 1","pages":"84 - 97"},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4483045","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}

{"title":"Herbig-Haro Flows and Young Stars in the Dobashi 5006 Dark Cloud","authors":"T. A. Movsessian,&nbsp;T. Yu. Magakian,&nbsp;A. S. Rastorguev,&nbsp;H. R. Andreasyan","doi":"10.1007/s10511-023-09770-6","DOIUrl":"10.1007/s10511-023-09770-6","url":null,"abstract":"<div><div><p>Two new Herbig-Haro flows were found in a study of the isolated Dobashi 5006 dark cloud (l = 216°.7, b = –13°.9): one certain (HH 1179) and one presumable, associated with the infrared sources 2MASS 06082284-0936139 and 2MASS 06081525-0933490, correspondingly. Judging from their spectral energy distributions, these sources may be Class 1 objects with luminosities of order 23 L_⨀ and 3.6 L_⨀, respectively. They are part of the poor star cluster MWSC 0739, study of which based on data from the Gaia DR3 survey has made it possible to detect 17 stars which are probably members of it. A list of them and their main parameters is given. The distance of the cluster is estimated to be 820 pc and the color excess on the path to the cluster is E(BP - RP) ≈ 1.05 mag. All of these stars are PMS-objects and most of them are optically variable. It is concluded that the newly discovered compact star-formation zone in the Dobashi 5006 cloud has an age of no more than a few million years and this process continues up to the present time.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"66 1","pages":"52 - 63"},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4484623","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}

{"title":"The Study of Kantowski-Sachs Perfect Fluid Cosmological Model in Modified Gravity","authors":"T. Vinutha,&nbsp;K. Niharika,&nbsp;K. S. Kavya","doi":"10.1007/s10511-023-09771-5","DOIUrl":"10.1007/s10511-023-09771-5","url":null,"abstract":"<div><div><p>Kantowski-Sachs perfect fluid cosmological model is explored in modified gravity with functional form <i>f</i> (<i>R</i>, <i>T</i>) = <i>f</i>₁(<i>R</i>) + <i>f</i>₂ (<i>T</i>) where <i>R</i> is Ricci scalar and <i>T</i> is the trace of energymomentum tensor. With this functional form, three different cases have been formulated, namely negative and positive powers of curvature, logarithmic curvature and exponential curvature given by <i>f</i>₁ (<i>R</i>) = <i>R</i> + γ <i>R</i>² – μ⁴ / <i>R</i>, <i>f</i>₁(<i>R</i>) = <i>R</i>+ <i>v</i> ln(τ<i>R</i>) and <i>f</i>₁(<i>R</i>) = <i>R</i>+ κ<i>e</i>^{–ι<i>R</i>} respectively, and for all these three cases, <i>f</i>₂ (<i>T</i>) = λ<i>T</i>, here γ,λ,μ,<i>v</i>,τ,κ and ι are constants. While solving the field equations, two constraints i) Expansion scalar is proportional to shear scalar ii) Hyperbolic scale factor are used. By using these conditions the required optimum solutions are obtained. The physical parameters are calculated and geometrical parameters of three cases are analysed against redshift z with the help of pictorial representation. In the context of <i>f</i> (R, T) gravity energy conditions are discussed with the help of pressure and energy density. If strong energy condition is positive the gravity should be attractive but in our model it is negative. It means that cosmic acceleration is due to antigravity, whereas NEC and DEC are fulfilled. The perturbation technique is used to test the stability of the background solutions of the obtained models. The inferences obtained from this paper are in persistent with the present cosmological observations and the model represents an accelerating universe.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"66 1","pages":"64 - 83"},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4484854","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}

{"title":"Effect of Neutrino Oscillations on the Thermodynamic Properties of Hot Quark Matter","authors":"G. B. Alaverdyan,&nbsp;G. S. Hajyan,&nbsp;A. G. Alaverdyan","doi":"10.1007/s10511-023-09775-1","DOIUrl":"10.1007/s10511-023-09775-1","url":null,"abstract":"<div><div><p>The effect of neutrino oscillations on the thermodynamic characteristics of three-flavor hot quark matter in β-equilibrium that is opaque for neutrinos is examined in terms of the local SU(3) Nambu-Jona-Lasinio (NJL) model which also accounts for the ‘t Hooft interaction that leads to quark flavor mixing. The thermodynamic characteristics of quark matter are determined for two temperatures, T = 60 and 100 MeV, with neutrino oscillations taken into account. These results are compared with those obtained without taking neutrino oscillations into account. The calculations show that during cooling of quark matter that is opaque to neutrinos, the energy released per unit of baryon charge is 150 ÷ 350 MeV.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"66 1","pages":"127 - 139"},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4484852","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}

{"title":"Optical Classification of BZG Objects from the BZCAT Blazar Catalog","authors":"H. V. Abrahamyan,&nbsp;A. M. Mickaelian,&nbsp;G. M. Paronyan,&nbsp;G. A. Mikayelyan,&nbsp;A. G. Sukiasyan","doi":"10.1007/s10511-023-09767-1","DOIUrl":"10.1007/s10511-023-09767-1","url":null,"abstract":"<div><div><p>In the blazar catalog BZCAT the objects are divided into 4 types: BZB, BZQ, BZG, and BZU. In this paper BZG objects are studied in order to determine their physical nature. Of the 274 BZG objects, 150 have optical spectra in the SDSS spectroscopic catalog, for which a detailed spectral classification has been carried out. A radio study showed that these objects mostly (69%) have a flat radio spectrum with a spectral index less than ±0.5. Quasars predominate among these kinds of radio spectra. However, with increasing distance, on the average the radio spectrum becomes steeper.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"66 1","pages":"11 - 23"},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4484851","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}

{"title":"Distances to 10 Nearby Galaxies Observed with the Hubble Space Telescope","authors":"I. D. Karachentsev,&nbsp;N. A. Tikhonov","doi":"10.1007/s10511-023-09766-2","DOIUrl":"10.1007/s10511-023-09766-2","url":null,"abstract":"<div><div><p>Images of 10 galaxies in F814W and F606W filters obtained on the Hubble Space Telescope (HST) are used to construct color-magnitude diagrams for the star population of these galaxies. The distances to the galaxies are estimated from the luminosity of the tip of the red giant branch. The galaxies examined here have radial velocities from 250 to 760 km/s relative to the centroid of the Local Group and distances ranging from 3.7 to 13.0 Mpc. Several other observed galaxies with low radial velocities are noted at distances beyond the limit of 13 Mpc.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"66 1","pages":"1 - 10"},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4784418","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}

{"title":"Theory of Classical Gaseous Polytropes in an Integral Representation. I. Some General Results","authors":"G. A. Saiyan","doi":"10.1007/s10511-023-09776-0","DOIUrl":"10.1007/s10511-023-09776-0","url":null,"abstract":"<div><div><p>The well known results of the theory of classical gaseous polytropes are presented in the framework of an integral approach where the standard Lane-Emden differential equation for a spherically symmetric gravitating mass is examined via its equivalent in the form of a nonlinear integral Volterra equation of the 2nd kind. It is shown that the inverse Laplace transform of the Lane-Emden equation for polytropes with an index of n=5 (Schuster model) is a recurrence relation for Bessel functions of the first kind. The invariance of the nonlinear integral Volterra equation with respect to homological transformations is shown, as well as the possibility of obtaining singular solutions under certain conditions. It is also shown that for whole integral and half integral polytrope indices, this equation is equivalent to a multidimensional integral equation, and finding the expansion of the Emden function in a power series of the dimensionless distance ξ from the center of the polytrope is equivalent to finding the Neumann series and the iterated nuclei in the Fredholm theory. Approximations of the Emden functions in closed form and their applicability to various astrophysical objects will be presented and discussed in the second part of this paper. Polytropes of other geometries and dimensionalities are not considered here.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"66 1","pages":"140 - 156"},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4784420","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}

{"title":"Photometric Study and Orbital Solution for Some Newly Discovered Eclipsing Binary Systems","authors":"M. S. Alenazi,&nbsp;M. M. Elkhateeb","doi":"10.1007/s10511-023-09768-0","DOIUrl":"10.1007/s10511-023-09768-0","url":null,"abstract":"<div><div><p>We present an orbital solution and light curve analysis for the three newly discovered W UMa systems: V0757 And, IK Lyn, and V0996 Per by means of first CCD observations. New times of minima were estimated and the observed light curves were analyzed using the most recent version of Wilson-Devinney modeling code (WD code) based on model atmospheres by Kurucz. The accepted models revealed some parameters describing the orbit of each system which showed that the primary components in all systems are massive and hotter than the secondary components. The spectral types of the systems’ components were adopted and the locations of the systems on the theoretical mass-luminosity and mass-radius relations revealed a good fit for all the systems components except the secondary components of the systems V0996 Per and V0757 And are located above the TAMS track.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"66 1","pages":"24 - 36"},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4483049","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}

{"title":"Поиск тетранейтрона в реакции фоторасщепления ядра висмута","authors":"Т. В. Котанджян, А. Ю. Алексанян, А. О. Кечечян, С. М. Амирханян, Г. Р. Гулканян, В. С. Погосов, Л. А. Погосян","doi":"10.54503/0002-3035-2023-58.1-10","DOIUrl":"https://doi.org/10.54503/0002-3035-2023-58.1-10","url":null,"abstract":"На линейном ускорителе электронов ННЛА (ЕрФИ) при средних энергиях\u0000Êе = 28 и 30 МэВ (с гауссовской шириной σе  0.7 МэВ) осуществлен поиск околопорогового образования четырехнейтронной системы в индуцированной тормозными фотонами реакции 209Bi(γ,4n)\u0000205Bi (с порогом Еγ\u0000th = 29.5 МэВ). В эксперименте\u0000был применен метод активационного анализа. Гамма-спектроскопические измерения проводились в подземной низкофоновой лаборатории ННЛА. Благодаря низкофоновым условиям удается при Ee = 30 МэВ надежно идентифицировать ядро 205Bi\u0000и впервые определить взвешенное по спектру тормозных фотонов сечение σw и\u0000усредненное по спектру тормозных фотонов сечение этого редкого околопорогового процесса: σw = (4.42  0.48)×10–4 мб и = (1.95  0.22) мб. При энергии\u0000Êе = 28 МэВ образования 205Bi не наблюдается. Низкофоновые условия позволяют\u0000также наблюдать редкий процесс распада долгоживущего (T1/2 = 3.68×105 лет) радионуклида 208Bi, образованного в однонейтронной реакции 209Bi(γ,n)\u0000208Bi, и измерить\u0000при энергиях Êе = 28 и 30 МэВ ее взвешенное и среднее сечения, соответственно,\u0000σw = (19.6 ± 3.5) и (16.4 ± 2.2) мб и = (139 ± 25) и (142 ± 19) мб. На основе данных\u0000при Êе = 28 МэВ установлена верхняя граница 10–5 выхода реакции образования гипотетического связанного состояния четырех нейтронов (тетранейтрона) по отношению к выходу реакции 209Bi(γ,n)\u0000208Bi. Проведено сравнение полученных\u0000экспериментальных данных с предсказаниями моделей TALYS1.9 и FLUKA. Показано, что предсказания моделей сильно (более чем на порядок) занижены по сравнению с измеренным при Êе = 30 МэВ сечением реакции 209Bi(γ, 4n)\u0000205Bi. Такое\u0000расхождение может быть обусловлено тем, что в моделях не предусмотрена возможность образования коррелированных нейтронных систем, в частности, резонансного\u0000состояния четырех нейтронов с энергией возбуждения около 2.4 МэВ, обнаруженного недавно в реакции 1\u0000H(8\u0000He,1\u0000H+4\u0000He)4n. По-видимому, наблюденное в данной работе околопороговое образование четырехнейтронной системы может служить\u0000косвенным указанием на ее резонансный характер.\u0000At the linear electron accelerator AANL (YerPhI), at mean electron energies Êе = 28\u0000and 30 MeV (with a Gaussian width σе  0.7 MeV), an attempt is undertaken to search for nearthreshold production of four-neutron system in the reaction 209Bi(γ,4n)\u0000205Bi (with the threshold\u0000energy Еγ\u0000th = 29.5 MeV) induced by bremsstrahlung photons. The induced activity method was\u0000applied in the experiment. The gamma-spectroscopic measurements were carried out in the\u0000underground laboratory of the AANL. Owing to low-background conditions in the laboratory,\u0000one achieves, at Êе = 30 MeV, a reliably identification of 205Bi radionuclide and first\u0000determination of the near-threshold cross sections of this rare process, namely, the weighted by\u0000the spectrum of bremsstrahlung photons cross section σw = (4.42  0.48)×10–4 mb and the\u0000averaged over the spectrum of bremsstrahlung photons cross section = (1.95  0.22) mb.\u0000No 205Bi production was observed at Êе = 28 MeV. Low-","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"24 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87329613","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}