منابع مشابه
Homologously Collapsing Stellar Cores
We investigate the collapse of nonrotating gas sp~eres with a polytropic.equ~tion of state.: n = 3, corresponding toy = 4/3. Such polytropes provide~ re~sonable approximatiOn t<? collapsmg stellar cores during the early phase before nuclear density IS reached. W~ find a.famtl~ of ~xact homologously collapsing configurations. Homologous collapse of the enti~e core Is possib~e If the pressure at ...
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Our understanding of the physical and chemical structure of pre-stellar cores, the simplest star-forming sites, has significantly improved since the last IAU Symposium on Astrochemistry (South Korea, 1999). Research done over these years has revealed that major molecular species like CO and CS systematically deplete onto dust grains at the interior of pre-stellar cores, while species like N2H +...
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We use hydrodynamic simulations with adaptive grid refinement to study the dependence of hot gas flows in X-ray luminous giant elliptical galaxies on the efficiency of heat supply to the gas. We consider a number of potential heating mechanisms including Type Ia supernovae and sporadic nuclear activity of a central supermassive black hole. As a starting point for this research we use an equilib...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1998
ISSN: 0074-1809
DOI: 10.1017/s0074180900238321