Is there a link between the neutron-star spin and the frequency of the kilohertz quasi-periodic oscillations?

Mariano Méndez*, Tomaso Belloni

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

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    There is a general consensus that the frequencies of the kilohertz quasi-periodic oscillations (kHz QPOs) in neutron-star low-mass X-ray binaries are directly linked to the spin of the neutron star. The root of this idea is the apparent clustering of the ratio of the frequency difference of the kHz QPOs, and the neutron-star spin frequency, Δν/νs, at around 0.5 and 1 in 10 systems for which these two quantities have been measured. Here, we re-examine all available data of sources for which there exist measurements of two simultaneous kHz QPOs and spin frequencies, and we advance the possibility that Δν and νs are not related to each other. We discuss ways in which this possibility could be tested with current and future observations.

    Original languageEnglish
    Pages (from-to)790-796
    Number of pages7
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number2
    Publication statusPublished - Oct-2007


    • Stars: neutron
    • X-rays: binaries

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