Astronomy Reports

, Volume 52, Issue 2, pp 138–151 | Cite as

A study of the X-ray pulsars X1845-024 and XTE J1858+034 based on INTEGRAL observations

  • V. A. Doroshenko
  • R. F. Doroshenko
  • K. A. Postnov
  • A. M. Cherepashchuk
  • S. S. Tsygankov
Article

Abstract

We present an analysis of observations of the relatively unstudied X-ray pulsars X1845-024 and XTE J1858+034 carried out from May 2003 through November 2004 using the JEM-X and IBIS telescopes of the INTEGRAL international gamma-ray observatory at energies of 5-70 keV. The X-ray spectra and light curves of the pulsars are constructed. During the observation period, outbursts at 18-70 keV at levels of 13 mCrab and 111 mCrab were detected for X1845-024 and XTE J1858+034, respectively. We refined the rotational period of the neutron star in XTE J1858+034 (220.4 s), measured its acceleration during the outburst, and derived a probable value of the orbital period (≃380 d).

PACS numbers

97.60.Gb 95.85.Nv 

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Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  • V. A. Doroshenko
    • 1
  • R. F. Doroshenko
    • 1
  • K. A. Postnov
    • 1
  • A. M. Cherepashchuk
    • 1
  • S. S. Tsygankov
    • 2
  1. 1.Sternberg Astronomical InstituteMoscow State UniversityMoscowRussia
  2. 2.Space Research InstituteRussian Academy of SciencesMoscowRussia

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