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Fortuitous findings and targets of opportunity

Due to the photometers' large field of view and the policy to observe a given field for at least one month, provision will be made to identify newly discovered novae, supernovae (less probable), flare stars, eclipsing binaries, RS CVn, and semi- and irregular variable stars. As an example, we mention Algol binaries with a large mass ratio, which are very hard to detect from the ground. Observation of such systems by STARS would be important for understanding the formation and evolution of binary stars (Plavec 1968). Furthermore, STARS will survey a significant fraction of the sky with very high photometric precision. It is premature to speculate about the outcome of this survey, but it is certainly safe to expect important discoveries concerning the statistics of variable stars. Gravitational focusing of light resulting from the passage of a massive body in front of a star leads to an increase in the apparent brightness of the star. Such events would be short lived, about 1 week for the passage of a brown dwarf, and lead to an intensity enhancement of up to 30% for perhaps one star in 106 per month. For a Jupiter-class planet the intensity could be enhanced by 10%. There is already a ground-based search under way; although ground-based searches might in principle be more suitable for this purpose, in practice an automated search of the STARS database might be more successful. Moreover, it would reach the more numerous microlenses with lower intensity enhancements, and thus provide valuable statistics for estimating the density of dark matter in the Galaxy.



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