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A relativistic model of stellar objects with core-crust-envelope division
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作者 Ravindra K.Bisht Satyanarayana Gedela +1 位作者 Neeraj Pant Neeraj Tewari 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2021年第7期71-83,共13页
In this work, we present a cogent and physically well-behaved solution for neutron stars envisaged with a core layer having quark matter satisfying the MIT-bag equation of state(Eo S), meso layer with Bose-Einstein co... In this work, we present a cogent and physically well-behaved solution for neutron stars envisaged with a core layer having quark matter satisfying the MIT-bag equation of state(Eo S), meso layer with Bose-Einstein condensate(BEC) matter satisfying modified BEC Eo S and an envelope having neutron fluid and Coulomb liquids satisfying quadratic Eo S. All the required physical and geometrical parameters like gravitational potentials, pressures, radial velocity, anisotropy, adiabatic index, mass function, compactification factor, and gravitational and surface redshift functions show a feasible trend and are continuous with smooth variation throughout the interior and across the regions of the star.Further, causality condition, energy conditions, static stability criterion(using Tolman-OppenheimerVolkoff equation) and Herrera cracking stability criterion are met throughout the star. The approach seems to be resulting in more realistic and accurate modeling of stellar objects, particularly realized by us for X-ray binary stars 4 U 1608–52(M = 1.7 M_⊙, R = 9.5 km) and SAX J1808.4–3658(M = 1.2 M_⊙,R = 7.2 km). Furthermore, we have ascertained that the continuity of the stability factor in all three regions of the stars demand a smaller core. As the core region of the star increases, the stability factor becomes discontinuous at all the interfaces inside the star. 展开更多
关键词 stars:interiors stars:neutron Galaxy:stellar content
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Boltzmann方程的矩形式及旋转慢收缩中子星中心附近的温度特性 被引量:2
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作者 陈次星 张家铝 《天文学报》 CSCD 北大核心 2000年第3期243-256,共14页
推出中子星在旋转慢塌缩情况下零质量粒子的Boltzmann方程及其矩形式 ,并研究了典型条件下的慢坍缩问题 ,而且在近热平衡及扩散近似下得到一个可直接研究中子星中心附近温度特性的有用方程 :aT4c-aT4=r H306N0N0e-N0 Λ- 13tsinθ.
关键词 旋转慢收缩 温度 矩形式 中子星 BOLTZMANN方程
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