搜索结果: 1-10 共查到“理论天体物理学 Dwarfs”相关记录10条 . 查询时间(0.187 秒)
Search for the coolest white dwarfs in the Galaxy
the coolest white dwarfs the Galaxy
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2011/1/10
A number of so-called ultra-cool white dwarfs have been detected in different surveys so far. However, based on anecdotal evidence it is believed that most or all of these ultra-cool white dwarfs are ...
The impact of chemical differentiation of white dwarfs on thermonuclear supernovae
chemical differentiation thermonuclear supernovae
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2011/1/10
Gravitational settling of 22Ne in cooling white dwarfs can affect the outcome of thermonuclear supernovae. We investigate how the supernova energetics and nucleosynthesis are in turn influenced by thi...
Near-Infrared Imaging Survey of Faint Companions around Young Dwarfs in the Pleiades Cluster
Near-Infrared Imaging Survey Faint Companions around Young Dwarfs
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2011/1/10
We conducted a near-infrared imaging survey of 11 young dwarfs in the Pleiades cluster using the Subaru Telescope and the near-infrared coronagraph imager. We found 10 faint point sources, with magnit...
Probing Intermediate Mass Black Holes With Optical Emission Lines from Tidally Disrupted White Dwarfs
Probing Intermediate Mass Black Holes Optical Emission Lines
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2011/1/13
We calculate the emission line spectrum produced by the debris released when a white dwarf (WD) is tidally disrupted by an intermediate-mass black hole (IMBH; $M\sim 10^{2}-10^{5}\msun$) and we explor...
Evidence for Terrestrial Planetary System Remnants at White Dwarfs
Terrestrial Planetary System Remnants White Dwarfs
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2011/1/13
The last several years have brought about a dynamic shift in the view of exoplanetary systems in the post-main sequence, perhaps epitomized by the evidence for surviving rocky planetary bodies at whit...
Double Detonation of Sub-Chandrasekhar White Dwarfs and Subluminous Type Ia Supernovae
Sub-Chandrasekhar White Dwarfs Subluminous Type Ia Supernovae
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2011/1/11
Type Ia supernovae are thought to result from thermonuclear explosions of carbon-oxygen white dwarf stars. This model generally explains the observed properties with certain exceptions, like sub-lumin...
Searching for Young M Dwarfs with GALEX
Stars: activity chromospheres coronae late-type ages – Surveys
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2010/11/15
The census of young moving groups in the solar neighborhood is significantly incomplete in the low-mass regime. We have developed a new selection process to find these missing members based on the GAL...
Ionisation in atmospheres of Brown Dwarfs and extrasolar planets I The role of electron avalanche
Brown Dwarfs extrasolar planets
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2011/1/10
Brown Dwarf and extrasolar planet atmospheres form clouds which strongly influence the local chemistry and physics. These clouds are globally neutral obeying dust-gas charge equilibrium which is, on s...
Effect of Radiative Levitation on Calculations of Accretion Rates in White Dwarfs
Solar and Stellar Astrophysics (astro-ph.SR)
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2010/12/29
Elements heavier than hydrogen or helium that are present in the atmospheres of white dwarfs with effective temperatures lower than 25,000 K, are believed to be the result of accretion. By measuring t...
Understanding the Oldest White Dwarfs: Atmospheres of Cool WDs as Extreme Physics Laboratories
Solar and Stellar Astrophysics (astro-ph.SR) Materials Science (cond-mat.mtrl-sci)
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2010/12/27
Reliable modeling of the atmospheres of cool white dwarfs is crucial for understanding the atmospheric evolution of these stars and for accurate white dwarfs cosmochronology. Over the last decade {\it...