A 421-d activity cycle in the BeX recurrent transient A0538-66 from MACHO monitoring

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. PrattPeter Quinn, C.W. Stubbs, W. Sutherland, A.B. Tomaney, T. Vandehei, D.L. Welch

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    Abstract

    We present a similar to5-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.
    Original languageEnglish
    Pages (from-to)678-684
    JournalMonthly Notices of the Royal Astronomical Society
    Volume321
    Issue number4
    DOIs
    Publication statusPublished - 2001

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