Constraints on the neutron star magnetic field of the two X-ray transients SAX J1808.4-3658 and Aql X-1

被引：49

作者：

Di Salvo, T

Burderi, L

机构：

[1] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands

[2] Univ Amsterdam, Ctr High Energy Astrophys, NL-1098 SJ Amsterdam, Netherlands

[3] Osserv Astron Roma, I-00040 Rome, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2003年 / 397卷 / 02期

关键词：

accretion disks; stars : individual : SAX J1808.4-3658; Aql X-1; stars : neutron; X-rays : stars; X-rays : binaries; X-rays : general;

D O I：

10.1051/0004-6361:20021491

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The recently discovered coherent X-ray pulsations at a frequency of similar to400 Hz in SAX J1808.4-3658, together with a measure of the source luminosity in quiescence, allow us to put an upper limit on the neutron star magnetic field, that is B less than or equal to 5 x 10(8) Gauss, using simple considerations on the position of the magnetospheric radius during quiescent periods. Combined with the lower limit inferred from the presence of X-ray pulsations, this constrains the SAX J1808.4-3658 neutron star magnetic field in the quite narrow range (1-5) x 10(8) Gauss. Similar considerations applied to the case of Aql X-1 give a neutron star magnetic field lower than similar to 10(9) Gauss.

引用

页码：723 / 727

页数：5

共 47 条

[31] The disk-magnetosphere interaction in the accretion-powered millisecond pulsar SAX J11808.4-3658 [J].