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A 421-d activity cycle in the BeX recurrent transient A0538–66 from MACHO monitoring
Authors:C Alcock  R A Allsman  D R Alves  T S Axelrod  A C Becker  D P Bennett  P A Charles  K H Cook  A J Drake  K C Freeman  M Geha  K Griest  M J Lehner  S L Marshall  K E McGowan    D Minniti  C A Nelson  B A Peterson  P Popowski  M R Pratt  P J Quinn  C W Stubbs  W Sutherland  AB Tomaney  T Vandehei  D L Welch
Institution:Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;Center for Particle Astrophysics, University of California, Berkeley, CA 94720, USA;Supercomputing Facility, Australian National University, Canberra, ACT 0200, Australia;Space Telescope Science Institute, Baltimore, MD 21218, USA;Research School of Astronomy and Astrophysics, Canberra, Weston Creek, ACT 2611, Australia;Departments of Astronomy and Physics, University of Washington, Seattle, WA 98195, USA;Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA;Department of Astrophysics, Nuclear Physics Laboratory, Keble Road, Oxford OX1 3RH;Department of Astronomy and Astrophysics, UC Santa Cruz, Santa Cruz, CA 90064, USA;Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA;Department of Physics, University of Sheffield, Sheffield S3 7RH;Departmento de Astronomia, P. Universidad Catolica, Casilla 104, Santiago 22, Chile;Department of Physics, University of California, Berkeley, CA 94720, USA;Center for Space Research, MIT, Cambridge, MA 02139, USA;European Southern Observatory, Karl-Schwarzschild Strasse 2, D-85748 Garching, Germany;Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
Abstract:We present a ~5-yr optical light curve of the recurrent Be/X-ray transient A0538–66 obtained as a by-product of the MACHO Project. These data reveal both a long-term modulation at P =420.8±0.8 d and a short-term modulation at 16.6510±0.0022 d which, within errors, confirms the previously found orbital period. Furthermore, the orbital activity is only seen at certain phases of the 421-d cycle, suggesting that the long-term modulation is related to variations in the Be star envelope.
Keywords:binaries: close  stars: individual: A0538–66  X-rays: stars
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