A 421 d Activity Cycle in the BeX Recurrent Transient A0538-66 from MACHO monitoring

Details A 421 d Activity Cycle in the BeX Recurrent Transient A0538-66 from MACHO monitoring A 421 d Activity Cycle in the BeX Recurrent Transient A0538-66 from MACHO monitoring

2000-09-26

arxiv.org/abs/astro-ph/0009415v1

Mon.Not.Roy.Astron.Soc. 321 (2001) 678

Astronomy and Astrophysics

Astrophysics

4 pages, 7 figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04041.x

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.

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