Multiperiodic Variability in Magellanic Cloud Be/X-Ray Binaries

Details Multiperiodic Variability in Magellanic Cloud Be/X-Ray Binaries Multiperiodic Variability in Magellanic Cloud Be/X-Ray Binaries

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.3388s&link_type=abstract

The Astronomical Journal, Volume 127, Issue 6, pp. 3388-3393.

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16

Stars: Pulsars: General, Stars: Emission-Line, Be, Stars: Variables: Other, X-Rays: Binaries

Scientific paper

The long-term photometric behavior of seven Be-neutron star binaries in the Magellanic Clouds has been examined using MACHO and OGLE-II data. All show small periodic outbursts, which we associate with the periastron passage of the neutron star and its interaction with the Be star's disk. Five of these systems are known X-ray pulsars. The orbital periods we find for these pulsars fall near the ``Corbet'' relation for orbital versus pulse periods for Be/X-ray binaries. In four systems we detect a previously unrecognized type of quasi-periodic variation that is present between the orbital outbursts. These variations may be related to the rotation of the disk.
This paper utilizes public-domain data obtained by the MACHO Project, jointly funded by the US Department of Energy through the University of California, Lawrence Livermore National Laboratory, under contract W-7405-ENG-48, by the National Science Foundation through the Center for Particle Astrophysics of the University of California under cooperative agreement AST 88-09616, and by the Mount Stromlo and Siding Spring Observatories, part of the Australian National University.

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