搜索结果: 1-8 共查到“天体物理学 Environments”相关记录8条 . 查询时间(0.082 秒)
The metallicity of gamma-ray burst environments from high energy observations
Gamma-ray burst general – Gamma-ray burst individual GRB050904 – early Universe – dark ages
2010/11/10
Context. Gamma-ray bursts (GRBs) and their early afterglows ionise their circumburst material. Only high-energy spectroscopy therefore, allows examination of the matter close to the burst itself. Soft...
The formation of polycyclic aromatic hydrocarbons in evolved circumstellar environments
Solar and Stellar Astrophysics (astro-ph.SR) Galaxy Astrophysics (astro-ph.GA)
2011/1/4
The formation of Polycyclic Aromatic Hydrocarbons in the circumstellar outflows of evolved stars is reviewed, with an emphasis on carbon stars on the Asymptotic Giant Branch. Evidence for PAHs present...
Near-IR Molecular Hydrogen Emission of Protostars: Probing Circumstellar Environments
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
We present new observations of near-infrared molecular hydrogen (H2) line emission in a sample of 18 Class I and flat-spectrum low mass protostars, primarily in the Tau- Aur and {\rho} Oph dark clouds...
Short Lifetime of Protoplanetary Disks in Low-metallicity Environments
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
We studied near-infrared disk fractions of six young clusters in the low-metallicity environments with [O/H$] \sim -0.7$ using deep $JHK$ images with Subaru 8.2\,m telescope.
Residence Times of Particles in Diffusive Protoplanetary Disk Environments I. Vertical Motions
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/27
The chemical and physical evolution of primitive materials in protoplanetary disks are determined by the types of environments they are exposed to and their residence times within each environment.
Star Formation in Extreme Environments: The Effects of Cosmic Rays and Mechanical Heating
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/24
Molecular data of extreme environments, such as Arp 220, but also NGC 253, show evidence for extremely high cosmic ray (CR) rates (10^3-10^4 * Milky Way) and mechanical heating from supernova driven t...
Radio Observations of SNR Environments。
The Circumstellar Environments of the Cool Hypergiants：Implications for the Mass Loss Mechanism
Cool Hypergiants Mass Loss Mechanism
2009/6/30
The Circumstellar Environments of the Cool Hypergiants：Implications for the Mass Loss Mechanism。