搜索结果: 46-60 共查到“行星际物理学”相关记录85条 . 查询时间(3.003 秒)
Horizon synthesis for archaeo-astronomical purposes
Methods: numerical – General: history and philosophy of astronomy
2011/10/18
In this paper I describe a simple numerical procedure to compute synthetic horizon altitude profiles for any given site. The method makes use of a simplified model of local Earth's curvature, and it i...
PTF1 J071912.13+485834.0: An outbursting AM CVn system discovered by a synoptic survey
outbursting system discovered synoptic survey
2011/9/29
We present extensive photometric and spectroscopic observations of PTF1 J071912.13+485834.0, an outbursting AM CVn system discovered by the Palomar Transient Factory (PTF). AM CVn systems are stellar ...
M-band Imaging of the HR 8799 Planetary System Using an Innovative LOCI-based Background Subtraction Technique
Planetary Using Innovative Background Subtraction Technique
2011/9/28
Multi-wavelength observations/spectroscopy of exoplanetary atmospheres are the basis of the emerging exciting field of comparative exoplanetology. The HR 8799 planetary system is an ideal laboratory t...
Tidal evolution of hierarchical and inclined systems
Restricted Problem Extended Body Dissipative Forces Planetary Systems Rotation
2011/9/28
We investigate the dynamical evolution of hierarchical three-body systems under the effect of tides, when the ratio of the orbital semi-major axes is small and the mutual inclination is relatively lar...
原行星盘是环绕在年轻星天体(如T Tauri型星,HAe/Be星)周围的气体尘埃盘,是具有初始角动量的分子云核在塌缩形成恒星过程中的自然结果,是行星系统的起源地。原行星盘研究不仅是恒星形成理论的重要组成部分,而且是行星形成理论的基础。首先介绍了盘的形成与演化规律;然后介绍了年轻星天体的能谱分布,盘的模型和参数(质量吸积率、质量、尺度、温度、寿命);随后讨论了尘埃颗粒在盘中生长的观测证据以及行星在盘...
Evolving Coronal Holes and Interplanetary Erupting Stream Disturbances
Sun coronal holes—interplanetary disturbances—interplanetary scintillation
2010/9/16
Coronal holes and interplanetary disturbances are important aspects of the physics of the Sun and heliosphere. Interplanetary disturbances are identified as an increase in the density turbulence compa...
Solar Cycle Variation of Interplanetary Coronal Mass Ejection Latitudes
Sun activity coronal mass ejections (CMEs)
2010/9/15
With the use of interplanetary coronal mass ejections (ICMEs) compiled by Richardson and Cane from 1996 to 2007 and the associated coronal mass ejections (CMEs) observed by the Large Angle and Spectro...
德国科学家发现火星表面有液态水存在新证据（图）
德国 火星 液态水
2010/4/29
德国明斯特大学行星学院的科学家4月28日报告说，他们分析了美国航天局的“火星勘测轨道飞行器”拍摄的图像，发现了火星表面至少在特定季节中有液态水存在的新证据。
Is exoplanet a 'waterworld'?（图）
exoplanet waterworld
2009/12/17
The best evidence yet of a planet beyond our solar system that is about the same size and temperature as the Earth has been released by a team of international astronomers. Preliminary measurements of...
Chemical signature could help locate Earth-like planets（图）
Chemical signature Earth-like planets
2009/10/21
New insights into the Sun's chemical composition may provide a new way to search for Earth-like planets orbiting distant stars – claims an international team of astrophysicists.Astronomers have alread...
NASA Space Telescope Discovers Largest Ring Around Saturn
NASA Space Telescope Largest Ring Saturn
2009/10/10
NASA's Spitzer Space Telescope has discovered an enormous ring around Saturn -- by far the largest of the giant planet's many rings.The new belt lies at the far reaches of the Saturnian system, with ...
Astronomers have been turning the world's most powerful telescopes toward Jupiter, the solar system's largest planet, ever since Australian amateur astronomer Anthony Wesley discovered a new dark mark...
Proper motions of the ansae in the planetary nebula NGC 7009
Proper motions planetary nebula NGC 7009
2009/7/9
Proper motions of the ansae in the planetary nebula NGC 7009。
Radial abundance gradients as observational constraints of galactic evolution：
planetary nebulae galactic evolution
2009/6/25
Radial abundance gradients as observational constraints of galactic evolution：
planetary nebulae and other objects。
Physical parameters of rr lyrae stars in the globular cluster ngc 5466：the oosterhoff
rr lyrae stars oosterhoff globular cluster ngc 5466
2009/6/25
Physical parameters of rr lyrae stars in the globular cluster ngc 5466：the oosterhoff
dichotomy。