Evolving stars pass through consecutive nuclear burning stages. The nuclear ashes, produced by a given nuclear fusion stage, can serve as nuclear fuel for a next burning phase if the temperature is high enough. The maximum temperature that can be attained in the stellar interior depends largely ...
Long Term EvolutionMIMO communicationchannel estimation3GPP LTE-advanced system level simulationFDD systemLTE-advanced specificationMIMOMatlabRelease 11We present ATCA observations of the H2O maser line and radio continuum at 18.0GHz and 22.8GHz, toward a sample of 192 massive star forming regions ...
Tracing early evolutionary stages of high-mass star formation with molecular lines Despite its major role in the evolution of the interstellar medium, the formation of high-mass stars (M > 10 Msol) is still poorly understood. Two types of... ...
Evolution of the Solar Nebula. II. Thermal Structure during Nebula Formation Models of the thermal structure of protoplanetary disks are required for understanding the physics and chemistry of the earliest phases of planet formation... AP Boss - 《Astrophysical Journal》 被引量: 179发表: 1993年 Fi...
Since the generation of the first stars (see Sect. 9.6) massive star-formation has been the major driver in the evolution of the universe as we know it today. Massive stars are the factories that produce elements up to iron during their lifetimes and enrich the ISM with heavy trace elements...
The former gives birth to a rich cluster and in the associated H II region BRCs are formed only at a later stage of its evolution in the peripheries. In the latter mode no clusters or only loose ones are formed, but BRCs can appear at earlier stages in inner part of the H II ...
We also provide the carbon mass fraction at the end of core-helium burning as a key parameter for later evolution stages, and approximate remnant masses for each model.West, Christopher; Heger, Alexander; Austin, Sam M 展开 关键词: nuclear physics and radiation physics astrophysics, cosmology ...
Chemical Evolution in High-Mass Star-Forming Regions: Results from the MALT90 Survey The chemical changes of high-mass star-forming regions provide a potential method for classifying their evolutionary stages and, ultimately, ages. In this ... S Hoq,JM Jackson,JB Foster,... - 《Astrophysical ...
Evolution of polycyclic aromatic hydrocarbons in photodissociation regions: hydrogenation and charge states. Astron. Astrophys. 552, A15 (2013). Article ADS Google Scholar Turner, B. E. A molecular line survey of Sagittarius B2 and Orion-KL from 70 to 115 GHz. II: analysis of the data. ...
Hierarchical mergers are one of the distinctive signatures of binary black hole (BBH) formation through dynamical evolution. Here, we present a fast semi-analytic approach to simulate hierarchical mergers in nuclear star clusters (NSCs), globular clusters (GCs) and young star clusters (YSCs). Hiera...