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| - On the stability of the 421-d periodicity in A0538-66
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| - In this paper we analyse 70 years of archival Harvard and Schmidt plate data of the 16.6-d Be X-ray binary A0538-66 in order to search for the presence of the long-term period of 420.82 ± 0.79 d found in MACHO photometry. We find evidence for a long-term period of 421.29 ± 0.95 d in the archival data, and examine its stability. We also combine the archival and MACHO data sets in order to improve the accuracy of the orbital period determination, using a cycle-counting analysis to refine its value to 16.6460 ± 0.0004 d. We also test the model proposed in our previous paper with observations documented in the literature for A0538-66 from 1980 to 1995, constraining the system inclination to be .
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