Chinese Journal of Astronomy and Astrophysics最新文献_第3页

Ring-Shaped Jets in Gamma-Ray Bursts 伽马射线暴中的环状喷流

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-08-20 DOI: 10.1088/1009-9271/8/4/05

Ming Xu, Yong-Feng Huang, S. Kong

引用次数: 4

First Mapping Observations of Two Possible Cloud Collision Candidates IRAS 02459+6029 and 05363+3127 两个可能的云碰撞候选者IRAS 02459+6029和05363+3127的首次测绘观测

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-08-01 DOI: 10.1088/1009-9271/8/4/07

Bei Xin, Jun-jie Wang

引用次数: 3

A Test on Different Types of the Time Curve of Hardness Ratio of Gamma-Ray Bursts based on the Curvature Effect 基于曲率效应的不同类型伽玛射线暴硬度比时间曲线的检验

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-08-01 DOI: 10.1088/1009-9271/8/4/09

L. Jia

引用次数: 3

A Running Average Method for Predicting the Size and Length of a Solar Cycle 预测太阳活动周期大小和长度的运行平均法

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-08-01 DOI: 10.1088/1009-9271/8/4/12

Z. Du, Huaning Wang, Liyun Zhang

{"title":"A Running Average Method for Predicting the Size and Length of a Solar Cycle","authors":"Z. Du, Huaning Wang, Liyun Zhang","doi":"10.1088/1009-9271/8/4/12","DOIUrl":"https://doi.org/10.1088/1009-9271/8/4/12","url":null,"abstract":"The running correlation coefficient between the solar cycle amplitudes and the max-max cycle lengths at a given cycle lag is found to vary roughly in a cyclical wave with the cycle number, based on the smoothed monthly mean Group sunspot numbers available since 1610. A running average method is proposed to predict the size and length of a solar cycle by the use of the varying trend of the coefficients. It is found that, when a condition (that the correlation becomes stronger) is satisfied, the mean prediction error (16.1) is much smaller than when the condition is not satisfied (38.7). This result can be explained by the fact that the prediction must fall on the regression line and increase the strength of the correlation. The method itself can also indicate whether the prediction is reasonable or not. To obtain a reasonable prediction, it is more important to search for a running correlation coefficient whose varying trend satisfies the proposed condition, and the result does not depend so much on the size of the correlation coefficient. As an application, the peak sunspot number of cycle 24 is estimated as 140.4±15.7, and the peak as May 2012±11 months.","PeriodicalId":124495,"journal":{"name":"Chinese Journal of Astronomy and Astrophysics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123753101","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: 23

Statistics of Superluminal Motion in Active Galactic Nuclei 活动星系核的超光速运动统计

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-08-01 DOI: 10.1088/1009-9271/8/4/02

Yong-Wei Zhang, J. Fan

引用次数: 12

Asteroseismic Analysis of α Cen B: Preliminary Tests of Effects of Rotation and Interior Magnetic Field in the Solar-like Star α半人马座B的星震分析:类日恒星自转和内部磁场影响的初步测试

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-08-01 DOI: 10.1088/1009-9271/8/4/06

Yanke Tang, S. Bi, N. Gai, Huabing Xu

引用次数: 2

A Photometric Study of the W UMa-Type Contact Binary RZ Com wuma型接触双星的光度学研究

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-08-01 DOI: 10.1088/1009-9271/8/4/10

Jia-jia He, S. Qian

{"title":"A Photometric Study of the W UMa-Type Contact Binary RZ Com","authors":"Jia-jia He, S. Qian","doi":"10.1088/1009-9271/8/4/10","DOIUrl":"https://doi.org/10.1088/1009-9271/8/4/10","url":null,"abstract":"We present results of CCD photometric observations of the short-period W UMa-type contact binary system, RZ Com. The light curve of the binary has changed from W-subtype to A-subtype from 1998 to 2003, then back to W-subtype in 2004. An analysis was carried out using the 2003 version of the Wilson-Devinney code. It is confirmed that RZ Com is a low-degree, overcontact f = 20.1% (+/- 7.4%) binary system with a high inclination of i = 81.degrees 40 (+/-.degrees 40), and a mass ratio q = 2.351 (+/- 0.031). Combining four newly determined times of light minimum with others in the literature, the variations in orbital period is examined. A small-amplitude oscillation (A=0.0065d), with a period of 41.5 year, is discovered superimposed on a long-term increase at rate dP/dt = +3.97 x 10(-8)d yr(-1). The period oscillation can be explained either by the light-time effect due to the presence of an unseen third body, or by cycles of magnetic activity on the components. Combining our photometric solution with the spectroscopic elements obtained by Mclean & Hilditch, the absolute dimensions of RZ Corn are: M(1) = 1.14 (+/- 0.19)M(circle dot), M(2) = 0.50 (+/- 0.09)M(circle dot), R(1) = 1.12 (+/- 0.01)R(circle dot), R(2) = 0.78 (+/- 0.01)R(circle dot) and A = 2.41 (+/- 0.02)R(circle dot).","PeriodicalId":124495,"journal":{"name":"Chinese Journal of Astronomy and Astrophysics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125238420","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: 14

A Critical Review of the Evidence for M32 being a Compact Dwarf Satellite of M31 rather than a More Distant Normal Galaxy 关于M32是M31的一个紧凑矮卫星而不是一个更遥远的正常星系的证据的评论

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-08-01 DOI: 10.1088/1009-9271/8/4/01

C. Ke-shih Young, Malcolm J Currie, Robert J Dickens, A-Li Luo, Tong-Jie Zhang

{"title":"A Critical Review of the Evidence for M32 being a Compact Dwarf Satellite of M31 rather than a More Distant Normal Galaxy","authors":"C. Ke-shih Young, Malcolm J Currie, Robert J Dickens, A-Li Luo, Tong-Jie Zhang","doi":"10.1088/1009-9271/8/4/01","DOIUrl":"https://doi.org/10.1088/1009-9271/8/4/01","url":null,"abstract":"Since Baade's photographic study of M32 in the mid 1940s, it has been accepted as an established fact that M32 is a compact dwarf satellite of M31. The purpose of this paper is to report on the findings of our investigation into the nature of the existing evidence. We find that the case for M32 being a satellite of M31 rests upon Hubble Space Telescope (HST) based stellar population studies which have resolved red-giant branch (RGB) and red clump stars in M32 as well as other nearby galaxies. Taken in isolation, this recent evidence could be considered to be conclusive in favour of the existing view. However, the conventional scenario does not explain M32's anomalously high central velocity dispersion for a dwarf galaxy (several times that of either NGC 147, NGC 185 or NGC 205) or existing planetary nebula observations (which suggest that M32 is more than twice as distant as M31) and also requires an elaborate physical explanation for M32's inferred compactness. Conversely, we find that the case for M32 being a normal galaxy, of the order of three times as distant as M31, is supported by: (1) a central velocity dispersion typical of intermediate galaxies, (2) the published planetary nebula observations, and (3) known scaling relationships for normal early-type galaxies. However, this novel scenario cannot account for the high apparent luminosities of the RGB stars resolved in the M32 direction by HST observations. We are therefore left with two apparently irreconcilable scenarios, only one of which can be correct, but both of which suffer from potentially fatal evidence to the contrary. This suggests that current understanding of some relevant fields is still very far from adequate.","PeriodicalId":124495,"journal":{"name":"Chinese Journal of Astronomy and Astrophysics","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122077573","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: 4

Historical Dataset Reconstruction and a Prediction Method of Solar 10.7cm Radio Flux 太阳10.7cm射电通量历史数据重建与预测方法

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-08-01 DOI: 10.1088/1009-9271/8/4/11

Juan Zhao, Yan-ben Han

引用次数: 11

Modeling epsilon Eri and Asteroseismic Tests of Element Diffusion epsilon Eri模型和元素扩散的星震试验

Chinese Journal of Astronomy and Astrophysics Pub Date : 2008-06-11 DOI: 10.1088/1009-9271/8/5/10

N. Gai, S. Bi, Yanke Tang

引用次数: 3