Can the anomalous X-ray pulsars be powered by accretion?

被引：12

作者：

Li, XD ^{[1
]}

机构：

[1] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 1999年 / 520卷 / 01期

关键词：

accretion; accretion disks; binaries : close; pulsars : general; stars : neutron; X-rays : stars;

D O I：

10.1086/307444

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The nature of the 5-12 s "anomalous" X-ray pulsars (AXPs) remains a mystery. Among the models that have been proposed to explain the properties of AXPs, the most likely are (1) isolated accreting neutron stars evolved from the Thorne-Zytkow objects (T(Z) over dot Os) due to complete spiral-in during the common envelope (CE) evolution of high-mass X-ray binaries (HMXBs), and (2) magnetars, which are neutron stars with ultrahigh (similar to 10(14)-10(15) G) surface magnetic fields. We have critically examined the predicted change of a neutron star's spin in the accretion model, and found that it is unable to account for the steady spin-down observed in AXPs. A simple analysis also shows that any accretion disk around an isolated neutron star has an extremely limited lifetime. A more promising explanation for such objects is the magnetar model.

引用

页码：271 / 275

页数：5

共 39 条

[1] ACCRETION ONTO MAGNETIZED NEUTRON STARS - STRUCTURE AND INTERCHANGE INSTABILITY OF A MODEL MAGNETOSPHERE [J].

ARONS, J ;

LEA, SM .

ASTROPHYSICAL JOURNAL, 1976, 207 (03) :914-936

[2]

ARONS J, 1980, APJ, V372, P565

[3] Pulse frequency changes of 1E 2259+586 and the binary interpretation [J].

Baykal, A ;

Swank, J .

ASTROPHYSICAL JOURNAL, 1996, 460 (01) :470-477

[4] Torque reversal and spin-down of the accretion-powered pulsar 4U 1626-67 [J].

Chakrabarty, D ;

Bildsten, L ;

Grunsfeld, JM ;

Koh, DT ;

Prince, TA ;

Vaughan, BA .

ASTROPHYSICAL JOURNAL, 1997, 474 (01) :414-425

[5] Deep infrared and optical studies of the fields of three proposed TZO remnants [J].

Coe, MJ ;

Pightling, SL .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 299 (01) :223-228

[6] THE SPECTRUM AND PULSES OF 1E-2259+586 FROM ASCA AND BBXRT OBSERVATIONS [J].

CORBET, RHD ;

SMALE, AP ;

OZAKI, M ;

KOYAMA, K ;

IWASAWA, K .

ASTROPHYSICAL JOURNAL, 1995, 443 (02) :786-794

[7] Evidence for FOR ''propeller'' effects in X-ray pulsars GX 1+4 and GRO J1744-28 [J].

Cui, W .

ASTROPHYSICAL JOURNAL, 1997, 482 (02) :L163-L166

[8]

DUBUS G, 1999, IN PRESS MNRAS

[9]

Frank J., 1992, ACCRETION POWER ASTR

[10] ACCRETION BY ROTATING MAGNETIC NEUTRON STARS .2. RADIAL AND VERTICAL STRUCTURE OF THE TRANSITION ZONE IN DISK ACCRETION [J].

GHOSH, P ;

LAMB, FK .

ASTROPHYSICAL JOURNAL, 1979, 232 (01) :259-276

← 1 2 3 4 →