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Reinvestigation of the electron fraction and electron Fermi energy of neutron star
Gao, Z. F.1,2; Shan, H.1; Wang, W.3; Wang, N.1
2017-12-01
Source PublicationASTRONOMISCHE NACHRICHTEN
ISSN0004-6337
Volume338Issue:9-10Pages:1066-1072
Corresponding AuthorGao, Z. F.(zhifugao@xao.ac.cn) ; Wang, N.(na.wang@xao.ac.cn)
AbstractIn this work, we reinvestigate the electron fraction Y-e and electron Fermi energy E-F(e) of neutron stars, based on our previous work, in which we first deduce a special solution to E-F(e), and then obtain several useful analytical formulae for Y-e and matter density within classical models and the relativistic mean-field (RMF) theory using numerical fitting. The advantages of this formalism include the following: (a) Linear functions are substituted for the nonlinear exponential functions used in the previous work. This method may be simpler and closer to realistic equation of state (EoS) of a neutron star (NS) because there are linear or quasi-linear relationships between number fractions of leptons and matter density, which can be seen by solving NS EoS. (b) We introduce a dimensionless variable rho (rho = rho/rho(0), rho(0) is the standard saturated nuclear density), which greatly reduces the scope of the fitting coefficients. (c) We present numerical errors including absolute and relative deviations between the data and fit. By numerical simulations, we obtain several analytical formulae for Y-e and rho for both APR98 and RMF models. Combining these analytical formulae with the special solution, we can calculate the value of E-F(e) for any given matter density. Since Y-e and E-F(e) are important in assessing the cooling rate of an NS and the possibility of kaon/pion condensation in the NS's interior, this formalism could be useful in the future studies on the thermal evolution of an NS.
Keywordelectron Fermi energy equation of state neutron star
DOI10.1002/asna.201713437
WOS KeywordSUPERHIGH MAGNETIC-FIELDS ; EQUATION-OF-STATE ; MATTER ; EVOLUTION ; EMISSION ; MASSES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000418755700020
PublisherWILEY-V C H VERLAG GMBH
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22512
Collection中国科学院紫金山天文台
Corresponding AuthorGao, Z. F.; Wang, N.
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, 150,Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing, Jiangsu, Peoples R China
3.Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Gao, Z. F.,Shan, H.,Wang, W.,et al. Reinvestigation of the electron fraction and electron Fermi energy of neutron star[J]. ASTRONOMISCHE NACHRICHTEN,2017,338(9-10):1066-1072.
APA Gao, Z. F.,Shan, H.,Wang, W.,&Wang, N..(2017).Reinvestigation of the electron fraction and electron Fermi energy of neutron star.ASTRONOMISCHE NACHRICHTEN,338(9-10),1066-1072.
MLA Gao, Z. F.,et al."Reinvestigation of the electron fraction and electron Fermi energy of neutron star".ASTRONOMISCHE NACHRICHTEN 338.9-10(2017):1066-1072.
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