The Impact of Large Databases on the Knowledge of Late-type Close Binaries

Details The Impact of Large Databases on the Knowledge of Late-type Close Binaries The Impact of Large Databases on the Knowledge of Late-type Close Binaries

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rmxac..21..239m&link_type=abstract

The Environment and Evolution of Double and Multiple Stars, Proceedings of IAU Colloquium 191, held 3-7 February, 2002 in Merida

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Binaries: Close, Binaries: Eclipsing, Astronomical Data Bases: Miscellaneous, Surveys

Scientific paper

This paper presents some results of the analysis of the eclipsing binaries samples that came out as by-products of the OGLE microlensing surveys. These experiments monitored millions of stars in the direction of the galactic bulge (OGLE-I), and of the Small Magellanic Cloud (OGLE-II). Their completeness allowed the discovery of rare and interesting systems. An example is a new group of long period binaries in the SMC with presumably a giant component in contact with the critical lobe, which dominates the systemic light variation (``β -contacts"). These systems obey a period-luminosity-color relation and could be used as an auxiliary, but independent, tool for distance determination. Another very interesting object, for its implications in the studies of angular momentum loss processes by magnetic braking and of stellar activity, is the system of shortest known period with M dwarf components, discovered by OGLE-I, BW3 V38, that is the target of a spectroscopic follow-up. The perspectives for close binary star research in view of future space missions, such as COROT and Eddington are briefly discussed.

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