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Revista mexicana de astronomía y astrofísica
versión impresa ISSN 0185-1101
Rev. mex. astron. astrofis vol.50 no.1 Ciudad de México abr. 2014
The surface gravitational redshift of the massive neutron star PSR J0348+0432
Xian-Feng Zhao1 and Huan-Yu Jia2
1 College of Mechanical and Electronic Engineering, Chuzhou University, Chuzhou, 239000, China. (zhaopioneer.student@sina.com).
2 Institute for Modern Physics, Southwest Jiaotong University, Chengdu 610031, China. (hyjia@home.swjtu.edu.cn).
Received 2013 October 30.
Accepted 2013 December 18.
RESUMEN
Se calcula el corrimiento al rojo gravitatorio en la superficie de la estrella neutrón masiva PSR J0348+0432 en el marco de la teoria relativista de campo medio, escogiendo adecuadamente las constantes de acoplamiento para los hiperones. Se encuentra que el intervalo de valores para el radio y el corrimiento al rojo gravitatorio en la superficie de PSR J0348+0432 es de 12.06212.957 km y 0.34730.04064, respectivamente. Según nuestros cálculos, los valores para el radio y el corrimiento al rojo gravitatorio para una estrella neutrón de masa canónica son de 13.245 km y 0.2226, respectivamente. Así, el corrimiento al rojo gravitatorio de PSR J0348+0432 resulta ser 1.561.8 veces mayor que el de la estrella neutrón de masa canónica.
ABSTRACT
The surface gravitational redshift of the massive neutron star PSR J0348+0432 is calculated in the framework of the relativistic mean field theory by choosing the suitable hyperon coupling constants. It is found that the value ranges of the radius and the surface gravitational redshift of the massive neutron star PSR J0348+0432 are determined as 12.06212.957 km and 0.34730.4064, respectively. In our calculations, the radius and the surface gravitational redshift of the canonical mass neutron star are, respectively 13.245 km and 0.2226. So, the surface gravitational red shift of the massive neutron star PSRJ 0348+0432 is about 1.561.8 times larger than that of the canonical mass neutron star.
Key Words: elementary particles gravitation stars: neutron.
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ACKNOWLEDGMENTS
This work was supported by the Scientific Research Program Foundation of the Higher Education Institutions of Anhui Province "Study on the massive neutron star PSR J0348+0432 in the framework of relativistic mean field theory", the Anhui Provincial Natural Science Foundation under grant 1208085MA09 and the Fundamental Research Funds for the Central Universities under grant SWJTU12ZT11.
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