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Accretion of helium and metal-rich gas onto neutron stars and black holes at high luminosities

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Abstract

Ultraluminous X-ray sources fed by Wolf-Rayet star winds and X-ray bursters in ultracompact binaries with He or C white dwarfs have accretion disks whose properties may differ significantly from those of pure Hα-accretion disks. Therefore, we have included the dependence on charge number Z and mean molecular weights μe/I in the Shakura and Sunyaev (1973) scaling relations for the key parameters of the disk. Furthermore, we also consider the pseudo-Newtonian potential of Paczyńsky and Wiita (1980). These scaling relations might become useful, e.g., when estimating the illumination efficiency of the outer parts of the disk. We also address the changes in the structure of the boundary (spreading) layer on the surfaces of neutron stars that occurs in the case of H-depleted accretion disks.

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Authors and Affiliations

  1. Max-Planck Institut für Astrophysik, Karl-Schwarzschild-Str. 1, Garching, 85741, Germany

    J. Dunkel, J. Chluba & R. A. Sunyaev

  2. Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117997, Russia

    R. A. Sunyaev

Authors
  1. J. Dunkel
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  2. J. Chluba
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  3. R. A. Sunyaev
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Published in Russian in Pis’ma v Astronomicheskiĭ Zhurnal, 2006, Vol. 32, No. 4, pp. 288–294.

The article was translated by the authors.

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Dunkel, J., Chluba, J. & Sunyaev, R.A. Accretion of helium and metal-rich gas onto neutron stars and black holes at high luminosities. Astron. Lett. 32, 257–262 (2006). https://doi.org/10.1134/S1063773706040062

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  • DOI: https://doi.org/10.1134/S1063773706040062

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