Excitation of a non-radial mode in a millisecond X-ray pulsar XTE J1751-305

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Abstract

We discuss non-radial modes in mass-accreting and rapidly rotating neutron stars for the coherent frequency detected in a millisecond X-ray pulsar XTE J1751-305. The spin frequency of the pulsar is νspin ≅ 435Hz and the identified frequency is νosc = 0.572 7595 × νspin. Assuming that the frequency detected is that in the corotating frame of the star, we examine r and g modes in the surface layer of accreting matter composed mostly of helium, inertial and r modes in the fluid core, and toroidal modes in the solid crust. We find that the r modes of ľ = m = 1 and 2 excited by ε-mechanism in the surface layer can give the ratio κ = νoscspin ≃ 0.57 at νspin = 435Hz, where m and ľ are the azimuthal wavenumber and the harmonic degree of the modes. We also suggest a toroidal crust mode and a core r mode destabilized by gravitational wave emission for the observed ratio κ. We find that the amplitude of the core r mode of ľ = m = 2 can be amplified at the surface layer by a large factor famp ∼ 102 at νspin = 435Hz for a M = 1.4M⊙ neutron-star model. This amplification, however, may not be large enough for the r-mode amplitude to be consistent with an estimation byMahmoodifar & Strohmayer (2013).

Original languageEnglish
Article numberstu1077
Pages (from-to)3037-3043
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume442
Issue number4
DOIs
Publication statusPublished - 2014 Aug

Keywords

  • Pulsars individual XTE J1751-305
  • Stars neutron
  • Stars oscillations
  • Stars rotation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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