Rotochemical heating in hybrid stars with modified Urca reactions in operation  

作　　者：魏薇 陈磊磊 

机构地区：[1]College of Science,Huazhong Agricultural University [2]College of Physical Science and Technology,Central China Normal University

出　　处：《Chinese Physics C》2012年第7期601-604,共4页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (1179008, 11003005)

摘　　要：We have recently shown that, as a compact star containing mixed-phase matter slows down, the compression can cause deconfinement phase transition, and thus enhance the chemical deviations and raise the chemical heating eiYiciency. In a previous study, only the direct Urca processes in nucleon and quark matter were considered. In this work, we extend the previous analysis to the case where the much slower modified Urca processes operate in nucleon matter. We find a fast promotion in the surface effective temperature of hybrid stars, and that the cooling process is dominated by both the nucleon and quark channels.We have recently shown that, as a compact star containing mixed-phase matter slows down, the compression can cause deconfinement phase transition, and thus enhance the chemical deviations and raise the chemical heating eiYiciency. In a previous study, only the direct Urca processes in nucleon and quark matter were considered. In this work, we extend the previous analysis to the case where the much slower modified Urca processes operate in nucleon matter. We find a fast promotion in the surface effective temperature of hybrid stars, and that the cooling process is dominated by both the nucleon and quark channels.

关 键 词：rotochemical heating deconfinment phase transition modified Urca process direct Urca process hybrid star 

分 类 号：O572.321[理学—粒子物理与原子核物理]