Magnetic field effects on the mass-radius relation of white dwarfs

被引：8

作者：

Alvear Terrero, D. ^{[1
]}

Castillo Garcia, M. ^{[1
]}

Manreza Paret, D. ^{[1
]}

Horvath, J. E. ^{[2
]}

Perez Martinez, A. ^{[3
]}

机构：

[1] Univ La Habana, Fac Fis, Havana 10400, Cuba

[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo, SP, Brazil

[3] Inst Cibernet Matemat & Fis ICIMAF, Havana 10400, Cuba

来源：

ASTRONOMISCHE NACHRICHTEN | 2015年 / 336卷 / 8-9期

基金：

巴西圣保罗研究基金会;

关键词：

equation of state; magnetic fields; white dwarfs; INSTABILITY;

D O I：

10.1002/asna.201512236

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the anisotropic equation of state (EoS) in both strong and weak magnetic field approximations, taking into account the statistical, vacuum, and Maxwell contributions. In the strong field regime, we perform a polytropic parametrization to the anisotropic EoS, showing that the polytropic index remains close to 4/3 and never reaches the value = 2. We solve the Tolman-Oppenheimer-Volkoff (TOV) equations with anisotropic pressures, discarding the super-Chandrasekhar masses for magnetized white dwarfs (WD). Also, we find the solutions of the anisotropic structure equations (considering cylindrical metric), which allows us to confirm the same bound of B approximate to 10(13) G from scalar virial theorem, since beyond this value there are no physical solutions. ((c) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

引用

页码：851 / 855

页数：5

共 15 条

[1] Abramowitz M., 1972, HDB MATH FUNCTIONS
[2] QUANTUM THEORY OF AN ELECTRON GAS IN INTENSE MAGNETIC FIELDS
CANUTO, V
CHIU, HY
[J]. PHYSICAL REVIEW, 1968, 173 (05): : 1210 - &
[3] The maximum mass of ideal white dwarfs
Chandrasekhar, S
[J]. ASTROPHYSICAL JOURNAL, 1931, 74 (01) : 81 - 82
[4] DYNAMICAL INSTABILITY OF WHITE DWARFS AND BREAKING OF SPHERICAL SYMMETRY UNDER THE PRESENCE OF EXTREME MAGNETIC FIELDS
Coelho, J. G.
Marinho, R. M.
Malheiro, M.
Negreiros, R.
Caceres, D. L.
Rueda, J. A.
Ruffini, R.
[J]. ASTROPHYSICAL JOURNAL, 2014, 794 (01)
[5] New Mass Limit for White Dwarfs: Super-Chandrasekhar Type Ia Supernova as a New Standard Candle
Das, Upasana
Mukhopadhyay, Banibrata
[J]. PHYSICAL REVIEW LETTERS, 2013, 110 (07)
[6] VIOLATION OF CHANDRASEKHAR MASS LIMIT: THE EXCITING POTENTIAL OF STRONGLY MAGNETIZED WHITE DWARFS
Das, Upasana
Mukhopadhyay, Banibrata
[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS D, 2012, 21 (11):
[7] Quantum instability of magnetized stellar objects
Felipe, RG
Cuesta, HJM
Martínez, AP
Rojas, HP
[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS, 2005, 5 (04): : 399 - 411
[8] Insignificance of the anomalous magnetic moment of charged fermions for the equation of state of a magnetized and dense medium
Ferrer, E. J.
de la Incera, V.
Manreza Paret, D.
Perez Martinez, A.
Sanchez, A.
[J]. PHYSICAL REVIEW D, 2015, 91 (08)
[9] Anisotropic stellar structure equations for magnetized strange stars
Manreza Paret, Daryel
Ernesto Horvath, Jorge
Perez Martinez, Aurora
[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2015, 15 (07) : 975 - 985
[10] ManrezaParet D., 2015, RES ASTRO A IN PRESS

← 1 2 →