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Possibilities of the analysis of brightness distributions for the components of eclipsing variables from high-precision photometry data 利用高精度测光数据分析食变量分量的亮度分布的可能性
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701306543
M. B. Bogdanov, A. Cherepashchuk
{"title":"Possibilities of the analysis of brightness distributions for the components of eclipsing variables from high-precision photometry data","authors":"M. B. Bogdanov, A. Cherepashchuk","doi":"10.1080/10556790701306543","DOIUrl":"https://doi.org/10.1080/10556790701306543","url":null,"abstract":"We carried out numerical experiments on the evaluation of the possibilities of obtaining information about the brightness distributions for the components of eclipsing variables from the high-precision photometry data expected to be obtained from the planned satellites COROT and Kepler. We examined a simple model of an eclipsing binary with spherical components on circular orbits and a linear law of limb darkening. The solutions of light curves have been obtained both by fitting a nonlinear model by a number of parameters including the limb-darkening coefficients and by solving the ill-posed inverse problem of restoration of brightness distributions across the discs of stars using a priori information about the form of these functions. The obtained estimates show that, if the observational accuracy is 10−4, then the limb-darkening coefficients can be found with a relative error of approximately 0.01. The brightness distributions across the discs of components can be restored to nearly the same accuracy as...","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"25 1","pages":"151-158"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83297968","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: 2
Long-term starspot activity of three short-period RS CVn stars: BH Vir, WY Cnc and CG Cyg 三颗短周期RS CVn恒星:BH Vir, WY Cnc和CG Cyg的长期恒星活动
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701300660
A. Kozhevnikova, I. Alekseev, P. Heckert, V. Kozhevnikov
{"title":"Long-term starspot activity of three short-period RS CVn stars: BH Vir, WY Cnc and CG Cyg","authors":"A. Kozhevnikova, I. Alekseev, P. Heckert, V. Kozhevnikov","doi":"10.1080/10556790701300660","DOIUrl":"https://doi.org/10.1080/10556790701300660","url":null,"abstract":"We present starspot analyses of CG Cyg, BH Vir and WY Cnc on the basis of our new photometric observations as well as published photometric data spanning almost 40 years. The spotted regions were concentrated at low latitudes up to 32°, the spots covered up to 29% of the stellar surface and all three stars show non-axisymmetric spot distributions (active longitude structures separated by approximately half the orbital period). We found that the variations in the brightness and spottedness of CG Cyg are probably cyclic with a period of about 20 years. We detected a large flare on WY Cnc (1.02×1035 erg in the B band) and analysed the WY Cnc spot activity before and during the flare.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"58 1","pages":"111-112"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84825733","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: 3
Dmitry Yakovlevich Martynov (1906–1989) Close binary stars in modern astrophysics (22–24 May 2006) Dmitry Yakovlevich Martynov(1906-1989)现代天体物理学中的近距离双星(2006年5月22-24日)
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701312152
A. Cherepashchuk
{"title":"Dmitry Yakovlevich Martynov (1906–1989) Close binary stars in modern astrophysics (22–24 May 2006)","authors":"A. Cherepashchuk","doi":"10.1080/10556790701312152","DOIUrl":"https://doi.org/10.1080/10556790701312152","url":null,"abstract":"","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79469409","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
Asynchronous polar BY Cam: periods, quasiperiods, accretion modes and magnetic field structure 异步极坐标:周期、准周期、吸积模式和磁场结构
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701300447
E. Pavlenko, J. Babina, M. Andreev
{"title":"Asynchronous polar BY Cam: periods, quasiperiods, accretion modes and magnetic field structure","authors":"E. Pavlenko, J. Babina, M. Andreev","doi":"10.1080/10556790701300447","DOIUrl":"https://doi.org/10.1080/10556790701300447","url":null,"abstract":"The asynchronous polar BY Cam in the low-brightness state displays observational evidence of the quadrupole component magnetic field of a magnetic white dwarf.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"15 1","pages":"91-92"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82183334","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
Core-collapse supernovae: magnetorotational mechanism 核心坍缩超新星:磁旋机制
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701351077
G. Bisnovatyi-Kogan, S. Moiseenko
{"title":"Core-collapse supernovae: magnetorotational mechanism","authors":"G. Bisnovatyi-Kogan, S. Moiseenko","doi":"10.1080/10556790701351077","DOIUrl":"https://doi.org/10.1080/10556790701351077","url":null,"abstract":"The results of two-dimensional numerical simulations of the magnetorotational (MR) supernova mechanism are presented. The shape of the explosion qualitatively depends on the symmetry type of the initial magnetic field. For the initial quadrupole-type magnetic field, the MR supernova explosion develops mainly near the equatorial plane while, for the initial dipole magnetic field, the MR supernova explosion has the shape of a mildly collimated proto-jet. The ejected energy in the MR supernova explosion in our simulations was about (0.5–0.6) × 1051 erg. MR instability was found during simulations of the MR supernova explosion and leads to the exponential growth of both the toroidal and the poloidal magnetic fields.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"53 1","pages":"71-74"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90756908","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: 1
Results of high-resolution optical spectroscopy investigation of Cyg X-1 = V1357 Cyg Cyg X-1 = V1357 Cyg的高分辨率光谱研究结果
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701324421
E. Karitskaya, M. I. Agafanov, N. Bochkarev, A. Bondar, G. Galazutdinov, B. Lee, F. Musaev, O. Sharova, V. Shimanskii, A. Tarasov
{"title":"Results of high-resolution optical spectroscopy investigation of Cyg X-1 = V1357 Cyg","authors":"E. Karitskaya, M. I. Agafanov, N. Bochkarev, A. Bondar, G. Galazutdinov, B. Lee, F. Musaev, O. Sharova, V. Shimanskii, A. Tarasov","doi":"10.1080/10556790701324421","DOIUrl":"https://doi.org/10.1080/10556790701324421","url":null,"abstract":"Selected results of optical high-resolution spectral observations (in 1997 and 2002–2004) are briefly reviewed. A comparison with ASM/RXTE X-ray data is made. The photometric and spectral variations point to supergiant parameter changes on a timescale of tens of years. Line profile non-local thermodynamic equilibrium simulations lead to the conclusion that the star radius increased about 1–4% from 1997 to 2003–2004 and the temperature decreased by 1300–2400 K.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"24 1","pages":"159-162"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81924811","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: 6
A tertiary component in close binary systems 紧密双星系统中的第三个组成部分
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701312558
H. Rovithis-Livaniou
{"title":"A tertiary component in close binary systems","authors":"H. Rovithis-Livaniou","doi":"10.1080/10556790701312558","DOIUrl":"https://doi.org/10.1080/10556790701312558","url":null,"abstract":"In this short review, the existence of third bodies in close binary systems is presented. Starting with the observational methods used to detect the tertiary component, we continue with the theoretical studies concerning the stability and evolution of triple systems and also of multiple systems in general. We next consider the type of tertiary component and give a list of catalogues for these systems; we end with a general discussion.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"23 1","pages":"23-30"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82030283","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
Magnetic configurations produced by hydromagnetic dynamos 由水力发电机产生的磁性结构
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701312186
D. Sokoloff
{"title":"Magnetic configurations produced by hydromagnetic dynamos","authors":"D. Sokoloff","doi":"10.1080/10556790701312186","DOIUrl":"https://doi.org/10.1080/10556790701312186","url":null,"abstract":"The dynamo mechanism is a generic physical mechanism which excites large-scale magnetic fields in stars (including the Sun), planets and galaxies. The dynamo action is based on two generators, i.e. differential rotation and the so-called α effect associated with mirror asymmetry of rotating convection or turbulence. We discuss why dynamo excitation gives dynamo waves of dipole symmetry in spherical shells and steady quadrupole configurations in galactic discs. The key factor determining the magnetic configuration is the direction, which gives the maximal shear of differential rotation. Dynamos with the shear directed along the shell grow steadily while dynamos based on the shear directed across the shell result in dynamo wave configurations.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"25 1","pages":"75-78"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85988136","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
Charge-coupled device-photometric observations of SS433 in 2003-2005 2003-2005年SS433的电荷耦合器件光度观测
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701295217
T. Irsmambetova
{"title":"Charge-coupled device-photometric observations of SS433 in 2003-2005","authors":"T. Irsmambetova","doi":"10.1080/10556790701295217","DOIUrl":"https://doi.org/10.1080/10556790701295217","url":null,"abstract":"Charge-coupled device–photometric BVRI observations of SS433 perfomed in Crimea in 2004–2005 are presented. Analysis of the variations in the colour indices B−V and V−R was made on different timescales. The ‘colour–magnitude’ V−(V−R) relations for both rapid and orbital variabilities possess typical features; the colour V−R decreases when the brightness of V increases. It has been shown that the object's reddening with decreasing brightness is caused not only by eclipses but also by its own variability. The behaviour of colour indices during the night can be explained by the interaction of the relativistic jets with the photosphere around the accretion disc.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"54 1","pages":"97-101"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89479531","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
Visual orbit of the third body on the eclipsing binary SZ Cam 食双星SZ Cam上第三个天体的目视轨道
Astronomical and Astrophysical Transactions Pub Date : 2007-09-05 DOI: 10.1080/10556790701306527
S. Gorda, Y. Balega, E. Pluzhnik, Z. U. Shkhagosheva
{"title":"Visual orbit of the third body on the eclipsing binary SZ Cam","authors":"S. Gorda, Y. Balega, E. Pluzhnik, Z. U. Shkhagosheva","doi":"10.1080/10556790701306527","DOIUrl":"https://doi.org/10.1080/10556790701306527","url":null,"abstract":"On the basis of new speckle interferometric and photometric observations of the eclipsing binary SZ Cam, executed on the 6 m telescope at the Special Astrophysical Observatory, Russian Academy of Sciences, and the 0.5 m telescope of the Astronomical Observatory, Ural State University, and data added from the literature, a complete set of parameters for the apparent relative orbit of the third body are determined for the first time. The mass of the third body, M 3=23.4 M ⊙, and the distance to SZ Cam, d=1125 pc, are estimated. The duality of the third body is confirmed. The assumption is stated that SZ Cam is probably not a member of the open star cluster NGC 1502, on which centre it is projected.","PeriodicalId":52135,"journal":{"name":"Astronomical and Astrophysical Transactions","volume":"366 3","pages":"145-146"},"PeriodicalIF":0.0,"publicationDate":"2007-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10556790701306527","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72437564","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: 1
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