Velocity Curve Analysis of Spectroscopic Binary Stars AI Phe, GM Dra, HD 93917 and V502 Oph by Nonlinear Regression     

K. Karami R. Mohebi 《中国天文和天体物理学报》2007,7(4):558-564

We introduce a new method to derive the orbital parameters of spectroscopic bi-nary stars by nonlinear least squares of (o-c). Using the measured radial velocity data of the four double lined spectroscopic binary systems, AI Phe, GM Dra, HD 93917 and V502 Oph, we derived both the orbital and combined spectroscopic elements of these systems. Our numerical results are in good agreement with the those obtained using the method of Lehmann-Filhe's.  相似文献   

分光双星HD144515和HD178428的轨道改进     

陆文贤 《天体物理学报》1990,10(2):145-153

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双谱食双星室女座CG的测光和视向速度研究     

沈良照  陆文贤 《天体物理学报》1990,10(2):137-146

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Stellar and HI Mass Functions Predicted by a Simple Preheating Galaxy Formation Model     

Zhi-Jian Luo Cheng-Gang Shu 《中国天文和天体物理学报》2007,7(4):590-594

According to the new preheating mechanism of galaxy formation suggested by Mo et al., we construct a simple model of formation of disk galaxies within the current paradigm of galaxy formation. It incorporates preheating, gas cooling, bulge formation and star for-mation. The predicted stellar and HI mass functions of galaxies are discussed and compared with the observations. It is found that our model can roughly match both the observed galaxy luminosity function and the observed HI-mass function.  相似文献   

A Survey of Newtonian Core-Shell Systems with Pseudo High Order Symplectic Integrator and Fast Lyapunov Indicator     

Jun-Fang Zhu Xin Wu Da-Zhu Ma 《中国天文和天体物理学报》2007,7(4):601-610

Newtonian core-shell systems, as limiting cases of relativistic core-shell models under the two conditions of weak field and slow motion, could account for massive circumstellar dust shells and rings around certain types of star remnants. Because this kind of systems have Hamiltonians that can be split into a main part and a small perturbing part, a good choice of the numerical tool is the pseudo 8th order symplectic integrator of Laskar ＆ Robutel, and, to match the symplectic calculations, a good choice of chaos indicator is the fast Lyapunov indicator （FLI） with two nearby trajectories proposed by Wu, Huang ＆ Zhang. Numerical results show that the FLI is very powerful when describing not only the transition from regular motion to chaos but also the global structure of the phase space of the system.  相似文献   

Disk Thicknesses and Some Parameters of 108 Non-Edge-On Spiral Galaxies     

Tao Hu Qiu-He Peng Hong-Shi Zong 《中国天文和天体物理学报》2007,7(4):579-589

We present disk thicknesses, some other parameters and their statistics of 108 non-edge-on spiral galaxies. The method for determining the disk thickness is based on solving Poisson's equation for a disturbance of matter density in three-dimensional spiral galaxies. From the spiral arms found we could obtain the pitch angles, the inclination of the galactic disk, and the position of the innermost point (the forbidden region with radius r 0 to the galactic center) of the spiral arm, and finally the thickness.  相似文献   

1:5万区域化探样品分析测试的质量监控     

陈绳权 《华北国土资源》2009,(1)

依据《地质矿产实验室测试质量管理规范》,并结合山西省的地质情况建立了一套1:5万区域化探样品分析测试的质量监控体系。分四个部分详细论述了的1:5万区域化探样品分析测试的质量监控体系。过去1:5万质量监控体系完全是靠人工进行,效率低下;本质量监控体系与过去相比,不但节省了大量的人力、物力,而且更加准确、迅速,更能适应1:5万质量监控大量数据处理的需要。  相似文献   

RS CVn型双星的自转测量和研究(Ⅱ)     

谭徽松  刘学富 《中国天文和天体物理学报》1986,(4)

我们用美国McDonald天文台2.1米反光镜Coude Reticon观测,对31个RS CVn型双星系统的37颗子星的自转进行了测量。并结合以前测得的38颗子星的数据,对RS CVn型星是否同步作了统计分析,结果表明,绝大多数都显示出同步自转性质;但无论是短周期、正常周期还是长周期组的,都有少数与同步自转不一致的例子。这与过去认为短周期和正常周期的呈同步自转,而长周期的呈非同步自转的结论不一致。  相似文献   

紫台Marly光谱仪的光度定标     

汪克敏  黄长春 《紫金山天文台台刊》1990,9(1):50-53

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多季相混合像元部分分解特征的不透水面分类     

陈姣  黄远程  李朋飞 《测绘科学》2021,46(4):90-99

针对利用光谱混合分解提取不透水面特征通常受到端元类型和数量的限制,同时植被变化会影响估计精度的问题,该文提出 了一种综合季相和植被变化信息的不透水面提取框架.基于混合像元部分分解算法——混合调谐匹配滤波(MTMF),设计了多季相组合MTMF(SCMTMF)特征和多季相叠加MTMF(SSMTMF)两种策略,构造了不透水面的多季相MTMF特征,将不透水特征与多季相植被指数结合利用支持向量机实现对不透水面的精确分类.结果表明,利用多季相特征得到的不透水面提取效果相较于单季相有较明显的改善,该文所提出的策略有利于提高不透水面的估计精度.  相似文献