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MILDLY RELATIVISTIC, BALLISTIC CORKSCREW JETS AS ROTATED SPIRALS 轻度相对论性的旋转螺旋弹道螺旋射流
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-10-01 DOI: 10.22201/ia.01851101p.2022.58.02.10
A. Raga, J. Cantó
{"title":"MILDLY RELATIVISTIC, BALLISTIC CORKSCREW JETS AS ROTATED SPIRALS","authors":"A. Raga, J. Cantó","doi":"10.22201/ia.01851101p.2022.58.02.10","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.02.10","url":null,"abstract":"Relativistic, corkscrew jets are produced by some Galactic compact objects (notably, the SS433 outflow) and by some of the central monsters of quasars or AGN. As the result of arrival time-delay effects, the projections of the outflow locus onto the observed plane of the sky are remarkably different for the (blueshifted) jet and the (redshifted) counterjet. In terms of a ballistic, precessing jet model, we show that for a range of outflow parameters these relativistic effects correspond to apparent changes in: the orientation angle of the precession axis, the opening angle of the precession cone and the flow velocity. This description is appropriate for outflows with v/c ≤ 0 . 5. azul). En t´erminos de un modelo de jet precesante bal´ıstico, mostramos que para un intervalo de par´ametros del flujo estos efectos relativistas corresponden a cambios aparentes en: la orientacion del eje de precesi´on, el ´angulo de apertura del cono de precesi´on y la velocidad del flujo. Esta descripci´on es apropiada para flujos con v/c ≤ 0 . 5.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47760878","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
ANN AND ANALYTICAL SOLUTIONS TO RELATIVISTIC ISOTHERMAL GAS SPHERES ANN与相对论等温气体球的解析解
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-10-01 DOI: 10.22201/ia.01851101p.2022.58.02.13
M. Nouh, Y. A. Azzam, E. Abdel-salam, F. Elnagahy, T. M. Kamel
{"title":"ANN AND ANALYTICAL SOLUTIONS TO RELATIVISTIC ISOTHERMAL GAS SPHERES","authors":"M. Nouh, Y. A. Azzam, E. Abdel-salam, F. Elnagahy, T. M. Kamel","doi":"10.22201/ia.01851101p.2022.58.02.13","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.02.13","url":null,"abstract":"Relativistic isothermal gas spheres are a powerful tool to model many astronomical objects, like compact stars and clusters of galaxies. In the present paper, we introduce an artificial neural network (ANN) algorithm and Taylor series to model the relativistic gas spheres using Tolman-Oppenheimer-Volkoff differential equations (TOV). Comparing the analytical solutions with the numerical ones revealed good agreement with maximum relative errors of 10−3. The ANN algorithm implements a three-layer feed-forward neural network built using a back-propagation learning technique that is based on the gradient descent rule. We analyzed the massradius relations and the density profiles of the relativistic isothermal gas spheres against different relativistic parameters and compared the ANN solutions with the analytical ones. The comparison between the two solutions reflects the efficiency of using the ANN to solve TOV equations.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49596065","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
A VINDICATION OF THE RR LYRAE FOURIER LIGHT CURVE DECOMPOSITION FOR THE CALCULATION OF METALLICITY AND DISTANCE IN GLOBULAR CLUSTERS 用傅立叶光曲线分解法计算球状星团中金属丰度和距离的证明
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-10-01 DOI: 10.22201/ia.01851101p.2022.58.02.08
A. Arellano
{"title":"A VINDICATION OF THE RR LYRAE FOURIER LIGHT CURVE DECOMPOSITION FOR THE CALCULATION OF METALLICITY AND DISTANCE IN GLOBULAR CLUSTERS","authors":"A. Arellano","doi":"10.22201/ia.01851101p.2022.58.02.08","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.02.08","url":null,"abstract":"We report the mean metallicity and absolute magnitude of RR Lyrae stars in a sample of 37 globular clusters, calculated via the Fourier decomposition of their light curves and ad hoc semi-empirical calibrations, in an unprecedented homogeneous approach. This enabled a new discussion of the metallicity dependence of the horizontal branch (HB) luminosity, as a fundamental distance indicator. The calibration for the RRab and RRc stars should be treated separately. For the RRab the dispersion is larger and non-linear. For the RRc stars the correlation is less steep, very tight and linear. The relevance of the HB structural parameter L, is highlighted and we offer a non-linear calibration of the form MV ([Fe/H], L). Excellent agreement is found between values of [Fe/H] and MV from the light curve decomposition with spectroscopic values and distances obtained via Gaia-DR3 and HST. The variables census in 35 clusters includes 326 stars found by our program.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68129180","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
OBSERVATIONAL CONSTRAINTS ON THE HD 5980 WIND-WIND COLLISION HD 5980风-风碰撞的观测约束
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-10-01 DOI: 10.22201/ia.01851101p.2022.58.02.19
G. Koenigsberger, N. Morrell, D. Hillier, W. Schmutz, R. Gamen, J. Arias, R. Barbá, G. Ferrero
{"title":"OBSERVATIONAL CONSTRAINTS ON THE HD 5980 WIND-WIND COLLISION","authors":"G. Koenigsberger, N. Morrell, D. Hillier, W. Schmutz, R. Gamen, J. Arias, R. Barbá, G. Ferrero","doi":"10.22201/ia.01851101p.2022.58.02.19","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.02.19","url":null,"abstract":"Analysis of spectral line profile variations observed over 6 decades in the Wolf-Rayet system HD 5980 lead to the conclusion that Star A, the variable member of the system, has always dominated the wind collision zone (WCZ), contrary to suggestions that before 1994 the stronger wind belonged to its close companion, Star B. The observed variations are caused by a combination of physical occultations, wind eclipses and emission and absorption originating in the WCZ. The effects caused by the leading WCZ branch, which folds around Star B, are clearly seen as it crosses our line of sight to Star A during the secondary eclipse. These effects can inform on the WCZ velocity and density structures. We speculate that differences in line profiles at the same orbital phase but at different epochs may be linked to changes in the WCZ radiative properties. The 2017-2020 spectra indicate that HD 5980 was in a higher activity state than during 2010-2015.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47628020","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
RR LYRAE STARS IN THE GLOBULAR CLUSTER PALOMAR 2 帕洛马2球状星团中的RR天琴座恒星
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-08-16 DOI: 10.22201/ia.01851101p.2023.59.01.01
A. Ferro, I. B. Fierro, S. Muneer, S. Giridhar
{"title":"RR LYRAE STARS IN THE GLOBULAR CLUSTER PALOMAR 2","authors":"A. Ferro, I. B. Fierro, S. Muneer, S. Giridhar","doi":"10.22201/ia.01851101p.2023.59.01.01","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2023.59.01.01","url":null,"abstract":"A CCD VI imaging time-series over 11-year is employed to explore the light curves of stars in the field of Palomar 2. We discovered 20 RRab and 1 RRc variables. A revision of Gaia-DR3 data enabled us to identify 10 more variables and confirm the RRab nature of 6 of them and one RGB. The cluster membership is discussed, and 18 variables are most likely cluster members. The Fourier light curve decomposition for the 11 best quality light curves of cluster member stars leads to independent estimates of the cluster distance 27.2 ± 1.8 kpc and [Fe/H]ZW = -1.39 ± 0.55. We confirm the cluster as of the Oo I type.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46631493","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
AN ASTROPHYSICAL PERSPECTIVE OF LIFE. THE GROWTH OF COMPLEXITY 对生命的天体物理学观点。复杂性的增长
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-08-06 DOI: 10.22201/ia.01851101p.2022.58.02.16
F. S'anchez, E. Battaner
{"title":"AN ASTROPHYSICAL PERSPECTIVE OF LIFE. THE GROWTH OF COMPLEXITY","authors":"F. S'anchez, E. Battaner","doi":"10.22201/ia.01851101p.2022.58.02.16","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.02.16","url":null,"abstract":"The existence of life is one of the most fundamental problems of astrophysics. The intriguing existence of progressively complex and apparently improbable living beings should be a general tendency of life in the Universe. We are looking for general physical laws governing the growth of complexity in any astrophysical environment. We posit the existence of a vital scalar field. This scalar is sensitive to the gradient of the inverse of specific entropy, such that its distribution tends to very high values in the interior of living beings. Besides the classical mutations, vital field driven mutations only produce decrements of entropy. The field equations give rise to the existence of vital waves. This theory is able to deal with both the origin of life and the evolution of life. We show that the growth of complexity is accelerated by the vital field.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48644228","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
THE PRINCIPAL ASTROPHYSICAL PARAMETERS OF THE OPEN CLUSTERS GULLIVER 18 AND GULLIVER 58 DETERMINED USING GAIA EDR3 DATA 利用gaia edr3数据确定了疏散星团格列佛18和格列佛58的主要天体物理参数
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-08-05 DOI: 10.22201/ia.01851101p.2022.58.02.17
A. Tadross, Eslam G. Elhosseiny
{"title":"THE PRINCIPAL ASTROPHYSICAL PARAMETERS OF THE OPEN CLUSTERS GULLIVER 18 AND GULLIVER 58 DETERMINED USING GAIA EDR3 DATA","authors":"A. Tadross, Eslam G. Elhosseiny","doi":"10.22201/ia.01851101p.2022.58.02.17","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.02.17","url":null,"abstract":"A photometric and astrometric study of the two open star clusters Gulliver18 and Gulliver58 was carried out for the first time using the early third data release of the Gaia space observatory (Gaia-EDR3). By studying the proper motions, parallaxes, and color-magnitude diagrams of the two clusters, we determined their actual cluster membership. Therefore, ages, color excesses, and heliocentric distances of the clusters could be determined. The luminosity function, mass function, total mass, mass segregation, and relaxation time of Gulliver18 and Gulliver58 were estimated as well.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46574411","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
INTERNATIONAL COLLABORATION FOR SCIENCE EDUCATION IN UNDERPRIVILEGED AREAS: THE CASE STUDY OF THE ALL-GIRLS “SCHOOL OF ASTRONOMY AND PHYSICS BY MIRWAT” IN PAKISTAN AND VIRTUAL VISITS TO THE VIRGO INTERFEROMETER 贫困地区科学教育的国际合作:巴基斯坦“米尔瓦特天文和物理女子学校”的案例研究和对处女座干涉仪的虚拟参观
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-08-01 DOI: 10.22201/ia.14052059p.2022.54.04
M. Shamshad, M. Chaniotakis, V. Boschi
{"title":"INTERNATIONAL COLLABORATION FOR SCIENCE EDUCATION IN UNDERPRIVILEGED AREAS: THE CASE STUDY OF THE ALL-GIRLS “SCHOOL OF ASTRONOMY AND PHYSICS BY MIRWAT” IN PAKISTAN AND VIRTUAL VISITS TO THE VIRGO INTERFEROMETER","authors":"M. Shamshad, M. Chaniotakis, V. Boschi","doi":"10.22201/ia.14052059p.2022.54.04","DOIUrl":"https://doi.org/10.22201/ia.14052059p.2022.54.04","url":null,"abstract":"As the world witnessed a swift change in every walk of life during the SARS-Cov2 pandemic, flexibility and adaption remained the key components for staying relevant in the field of science education. However, beyond the need for quick adaptation and acquisition of digital skills by both teachers and students, the digital transformation in education has opened up a window of opportunity making global and remote engagement possible for everyone. This paper presents the good practice of Virtual Visits to Virgo Gravitational Wave Detector coorganized by EGO-Virgo, the FRONTIERS and REINFORCE EU funded projects and the “School of Astronomy and Physics by Mirwat” with the participation of high school girls from Islamabad and remote regions of Pakistan. This paper presents the prospect of international collaboration for STEM education, early exposure to research environment to build the deeper understanding of the functioning and working of large research infrastructure, building science identity by informal science experiences and to empower the high school students by engagement in content creation activity. The experience indicates a positive outcome and improvement in understanding of students as well as a step towards building a science identity among them.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":"52 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84500542","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
SONOUNO WEB INTERFACE FOR SONIFICATION AND ANALYSIS OF ASTROPHYSICAL DATA 用于天体物理数据的超声和分析的Sonouno网络接口
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-08-01 DOI: 10.22201/ia.14052059p.2022.54.28
J. Casado, G. de la Vega, L. M. E. Dominguez, B. García
{"title":"SONOUNO WEB INTERFACE FOR SONIFICATION AND ANALYSIS OF ASTROPHYSICAL DATA","authors":"J. Casado, G. de la Vega, L. M. E. Dominguez, B. García","doi":"10.22201/ia.14052059p.2022.54.28","DOIUrl":"https://doi.org/10.22201/ia.14052059p.2022.54.28","url":null,"abstract":"Nowadays visualization is the main method to display and analyze scientific information in astronomy, only one sense analyzing a big amount of datasets, even after 20 years of formal meeting to discuss the use and capabilities of sonification. Beyond the reluctance to use sonification, there is a growing need for new forms of data display either for research or for outreach. In this sense, and centred mainly on research, SonoUno start been developed. In this opportunity, the sonoUno web interface is presented, the aim of this contribution is to produce a tool for users who don't need large datasets, or are simply interested in testing the concepts of the SonoUno project, without going through all the trouble of installing a full featured SonoUno system. The results are promising, real data sets were opened, sonified and some mathematical functions applied.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":"32 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82400778","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
DISSEMINATION OF THE “TOUCH THE UNIVERSE” TACTILE EXHIBITION 传播“触摸宇宙”触觉展
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-08-01 DOI: 10.22201/ia.14052059p.2022.54.12
K. Usuda-Sato, Y. Suzuki, S. Kawashima, Y. Goko, T. Inoue
{"title":"DISSEMINATION OF THE “TOUCH THE UNIVERSE” TACTILE EXHIBITION","authors":"K. Usuda-Sato, Y. Suzuki, S. Kawashima, Y. Goko, T. Inoue","doi":"10.22201/ia.14052059p.2022.54.12","DOIUrl":"https://doi.org/10.22201/ia.14052059p.2022.54.12","url":null,"abstract":"We created a whole set of the \"Touch the Universe\" tactile exhibition, including 3D models of celestial bodies and telescopes that both blind and visually impaired (BVI) people and sighted people can understand and enjoy. Through the JAPAN Science Museum Association network, science museums in Japan can easily borrow it and hold their own tacile exhibition without using a 3D printer. The exhibition set consists of existing 3D models, additional tactile images, scale models of the Solar System. Each model has a concise description panel with both printed and braille letters. This easy-to-use set can be a breakthrough for science museum staff members to hold their own tactile exhibition and communicate with BVI people.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":"72 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91253845","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
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