A method to constrain the neutron star magnetic field in Low Mass X-ray Binaries

Natale Robba, Tiziana Di Salvo, Rosario Iaria, Burderi, Giuseppe Lavagetto

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We describe here a method to put an upper limit to the strength of the magnetic field of neutron stars in low mass X‐ray binaries for which the spin period and the X‐ray luminosity during X‐ray quiescent periods are known. This is obtained using simple considerations about the position of the magnetospheric radius during quiescent periods. We applied this method to the accreting millisecond pulsar SAX J1808.4‐3658, which shows coherent X‐ray pulsations at a frequency of ∼ 400 Hz and a quiescent X‐ray luminosity of ∼ 5 × 1031 ergs/s, and found that B ⩽ 5 × 108 Gauss in this source. 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) × 108 Gauss. Similar considerations applied to the case of Aql X‐1 and KS 1731‐260 give neutron star magnetic fields lower than ∼ 109 Gauss.
Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages690-696
Number of pages7
Publication statusPublished - 2005

Publication series

NameAIP CONFERENCE PROCEEDINGS

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neutron stars
luminosity
magnetic fields
x rays
pulsars
radii

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Robba, N., Di Salvo, T., Iaria, R., Burderi, & Lavagetto, G. (2005). A method to constrain the neutron star magnetic field in Low Mass X-ray Binaries. In AIP Conference Proceedings (pp. 690-696). (AIP CONFERENCE PROCEEDINGS).

A method to constrain the neutron star magnetic field in Low Mass X-ray Binaries. / Robba, Natale; Di Salvo, Tiziana; Iaria, Rosario; Burderi; Lavagetto, Giuseppe.

AIP Conference Proceedings. 2005. p. 690-696 (AIP CONFERENCE PROCEEDINGS).

Research output: Chapter in Book/Report/Conference proceedingChapter

Robba, N, Di Salvo, T, Iaria, R, Burderi & Lavagetto, G 2005, A method to constrain the neutron star magnetic field in Low Mass X-ray Binaries. in AIP Conference Proceedings. AIP CONFERENCE PROCEEDINGS, pp. 690-696.
Robba N, Di Salvo T, Iaria R, Burderi, Lavagetto G. A method to constrain the neutron star magnetic field in Low Mass X-ray Binaries. In AIP Conference Proceedings. 2005. p. 690-696. (AIP CONFERENCE PROCEEDINGS).
Robba, Natale ; Di Salvo, Tiziana ; Iaria, Rosario ; Burderi ; Lavagetto, Giuseppe. / A method to constrain the neutron star magnetic field in Low Mass X-ray Binaries. AIP Conference Proceedings. 2005. pp. 690-696 (AIP CONFERENCE PROCEEDINGS).
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AU - Lavagetto, Giuseppe

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AB - We describe here a method to put an upper limit to the strength of the magnetic field of neutron stars in low mass X‐ray binaries for which the spin period and the X‐ray luminosity during X‐ray quiescent periods are known. This is obtained using simple considerations about the position of the magnetospheric radius during quiescent periods. We applied this method to the accreting millisecond pulsar SAX J1808.4‐3658, which shows coherent X‐ray pulsations at a frequency of ∼ 400 Hz and a quiescent X‐ray luminosity of ∼ 5 × 1031 ergs/s, and found that B ⩽ 5 × 108 Gauss in this source. 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) × 108 Gauss. Similar considerations applied to the case of Aql X‐1 and KS 1731‐260 give neutron star magnetic fields lower than ∼ 109 Gauss.

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