搜索结果: 61-75 共查到“知识库 恒星与银河系”相关记录734条 . 查询时间(3.16 秒)
Physical Processes of Interstellar Turbulence
Physical Processes Interstellar Turbulence self-gravity radiative heating
2012/2/23
I discuss the role of self-gravity and radiative heating and cooling in shaping the nature of the turbulence in the interstellar medium (ISM) of our galaxy. The heating and cooling cause it to be high...
No role for muons in the DAMA annual modulation results
No role muons DAMA annual modulation results
2012/2/23
Since long time it has been pointed out by the DAMA collaboration that muons surviving the Gran Sasso mountain cannot mimic the Dark Matter annual modulation signature exploited by the DAMA/NaI and DA...
Non-relativistic Extended Gravity and its applications across different astrophysical scales
Non-relativistic Extended Gravity applications different astrophysical scales
2012/2/23
Using dimensional analysis techniques we present an extension of Newton's gravitational theory built under the assumption that Milgrom's acceleration constant is a fundamental quantity of nature. The ...
A Bayesian Approach to Calibrating Period-Luminosity Relations of RR Lyrae Stars in the Mid-Infrared
statistical methods RR Lyrae distance scale
2012/2/23
A Bayesian approach to calibrating period-luminosity (PL) relations has substantial benefits over generic least-squares fits. In particular, the Bayesian approach takes into account the full prior dis...
Evidence for Multiple Pathways to Deuterium Enhancements in Protoplanetary Disks
Evidence Multiple Pathways Deuterium Enhancements Protoplanetary Disks
2012/2/23
The distributions of deuterated molecules in protoplanetary disks are expected to depend on the molecular formation pathways. We use observations of spatially resolved DCN emission from the disk aroun...
A Relic Star Cluster in the Sextans Dwarf Spheroidal Galaxy - Implications for Early Star and Galaxy Formation
Relic Star Cluster the Sextans Dwarf Spheroidal Galaxy Implications Galaxy Formation
2012/2/23
We present tentative evidence for the existence of a dissolved star cluster in the Sextans dwarf spheroidal galaxy. In a sample of six stars, we identify three (possibly four) stars around [Fe/H] =-2....
The Progenitor Mass of SN 2011dh from Stellar Populations Analysis
Progenitor Mass Stellar Populations Analysis
2011/10/18
Using Hubble Space Telescope (HST) photometry, we characterize the age of the stellar association in the vicinity of supernova (SN) 2011dh and use it to infer the zero-age main sequence mass (M_{ZAMS}...
继《波源、介质、观察者相对运动时，波源的测定》[1]后，本文从多方位论证了光的传播需要介质及“以太”存在可能性。其中，以新的拖曳理论重新解释了迈克尔逊——莫雷实验、斐索实验，用波动模型解释了双星实验：并补充了多普勒效应、同步回旋加速器实验等大量的物理理论和实验为依据。同时进一步论证了在宏观物理领域经典波动理论是正确的；光的粒子模型主要适用微观物理领域。
基于星云的流体力学和磁流体动力学，用非线性方程的定性分析理论讨论了双星的形成。非线性相互作用和旋转取到非常关键的作用。此外，Lorenz模型可以由流体力学方程导出，模型中的双翼正好形成双星。而线性方程仅仅形成单星。
Dynamical Tides in Eccentric Binaries and Tidally-Excited Stellar Pulsations in KEPLER KOI-54
binaries: close|stars: oscillations|stars: rotation|stars: individual: HD187091 (KOI-54)
2011/10/13
Recent observation of the tidally-excited stellar oscillations in the main-sequence binary KOI-54 by the KEPLER satellite provides a unique opportunity for studying dynamical tides in eccentric binary...
I show that, in the context of MOND, non-isothermal models, approximated by high order polytropic spheres, are consistent with the observations of the radial distribution of the line-of-sight velocity...
Enhancement of nuclear pasta formation due to multi-nucleus simultaneous collision is presented based on time-dependent density functional calculations with periodic boundary condition. This calculati...
A Mid-Infrared Indicator for Total Infrared Luminosity and Star Formation Rate of Local and High-Redshift Galaxies
Indicator Total Infrared Luminosity High-Redshift Galaxies
2011/10/9
We present a new method to use 24 micron observations to estimate the total infrared luminosity, LIR, and the star formation rate of star-forming galaxies across the redshift range 0 < z < 3. This is ...
The Kepler characterization of the variability among A- and F-type stars. I. General overview
Asteroseismology - Stars: oscillations - Stars: variables: δ Scuti - Stars: fundamental parameters - binaries: general - Stars: statistics
2011/9/27
The Kepler spacecraft is providing time series of photometric data with micromagnitude precision for hundreds of A-F type stars. We present a first general characterization of the pulsational behaviou...
Evolution of star clusters in arbitrary tidal fields
globular clusters: general – open clusters and associations: general – galaxies: star clusters – methods: analytical – methods: numerical
2011/10/20
We present a novel and flexible tensor approach to computing the effect of a time-dependent tidal field acting on a stellar system. The tidal forces are recovered from the tensor by polynomial interpo...