---
res:
  bibo_abstract:
  - 'In an accreting X-ray pulsar, a neutron star accretes matter from a companion
    star through an accretion disk. The magnetic field of the rotating neutron star
    disrupts the inner edge of the disk, funnelling the gas to flow onto the poles
    on its surface. Hercules X-1 is a prototypical persistent X-ray pulsar about 7 kpc
    from Earth. Its emission varies on three distinct timescales: the neutron star
    rotates every 1.2 s, it is eclipsed by its companion each 1.7 d, and the system
    exhibits a superorbital period of 35 d, which has remained stable since its discovery.
    Several lines of evidence point to the source of this variation as the precession
    of the accretion disk or that of the neutron star. Despite the many hints over
    the past 50 yr, the precession of the neutron star itself has yet not been confirmed
    or refuted. X-ray polarization measurements (probing the spin geometry of Her
    X-1) with the Imaging X-ray Polarimetry Explorer suggest that free precession
    of the neutron star crust sets the 35 d period; this has the important implication
    that its crust is somewhat asymmetric by a few parts per ten million.@eng'
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      foaf_name: Heyl, Jeremy
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      foaf_givenName: Victor
      foaf_name: Doroshenko, Victor
      foaf_surname: Doroshenko
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      foaf_givenName: Denis
      foaf_name: González-Caniulef, Denis
      foaf_surname: González-Caniulef
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      foaf_givenName: Ilaria
      foaf_name: Caiazzo, Ilaria
      foaf_surname: Caiazzo
      foaf_workInfoHomepage: http://www.librecat.org/personId=8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
    orcid: 0000-0002-4770-5388
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      foaf_name: Poutanen, Juri
      foaf_surname: Poutanen
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      foaf_givenName: Alexander
      foaf_name: Mushtukov, Alexander
      foaf_surname: Mushtukov
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      foaf_givenName: Sergey S.
      foaf_name: Tsygankov, Sergey S.
      foaf_surname: Tsygankov
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      foaf_givenName: Demet
      foaf_name: Kirmizibayrak, Demet
      foaf_surname: Kirmizibayrak
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      foaf_givenName: Matteo
      foaf_name: Bachetti, Matteo
      foaf_surname: Bachetti
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      foaf_givenName: George G.
      foaf_name: Pavlov, George G.
      foaf_surname: Pavlov
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      foaf_givenName: Sofia V.
      foaf_name: Forsblom, Sofia V.
      foaf_surname: Forsblom
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      foaf_givenName: Christian
      foaf_name: Malacaria, Christian
      foaf_surname: Malacaria
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      foaf_givenName: Valery F.
      foaf_name: Suleimanov, Valery F.
      foaf_surname: Suleimanov
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      foaf_givenName: Iván
      foaf_name: Agudo, Iván
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      foaf_name: Bellazzini, Ronaldo
      foaf_surname: Bellazzini
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      foaf_surname: Bianchi
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      foaf_givenName: Raffaella
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      foaf_givenName: Svetlana G.
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      foaf_name: Krawczynski, Henric
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      foaf_name: La Monaca, Fabio
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  bibo_doi: 10.1038/s41550-024-02295-8
  bibo_volume: 8
  dct_date: 2024^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/2397-3366
  dct_language: eng
  dct_publisher: Springer Nature@
  dct_title: Complex rotational dynamics of the neutron star in Hercules X-1 revealed
    by X-ray polarization@
...