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Evolutionary and distance estimation issues for eclipsing binaries (EBs) are examined in the context of spin-off from gravitational lens surveys and the GAIA mission. The OGLE survey shows a major deficiency of normal Algol type binaries in the Small Magellanic Cloud. Statistical analysis coupled with further observing will be needed to decide if the Algol shortfall is an evolutionary effect connected...
New results on the properties of eclipsing spectroscopic binary stars, in the Small Magellanic Cloud (SMC), that are composed of two massive stars of spectral types O and B are reviewed. The data sets include multi-colour photometry and spectroscopy of individual binaries, I-band photometry of large numbers of binaries from the OGLE II survey, and multiplexed spectroscopy of many binaries discovered...
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