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

Published online by Cambridge University Press:  22 February 2018

C. Maceroni
C. Maceroni*
Affiliation:
Osservatorio Astronomico di Roma, INAF, Italy.

Abstract

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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.

Resumen

Resumen

Presentamos algunos resultados del análisis de las muestras de binarias eclipsantes que han aportado los sondeos de microlentes OGLE. Estos experimentos observaron millones de estrellas en la dirección del bulbo galáctico (OGLE-I) y de la Nube Menor de Magallanes (OGLE-II). Su completez ha permitido el descubrimiento de sistemas raros e interesantes. Ejemplo de ello es un nuevo grupo de binarias de largo período en la NMM con una gigante en contacto con el lóbulo crítico, la cual domina la variación de luz del sistema (”β-contacts”). Estos sistemas obedecen una relación período-luminosidad, y podrían ser utilizados como herramienta auxiliar e independiente para determinar distancias. Otro objeto interesante por sus implicaciones para el estudio de la pérdida de momento angular por frenado magnético, así como de la actividad estelar, es BW3 V38, el sistema de enanas M de más corto período conocido, que fue descubierto por el OGLE-I, y que será estudiado espectroscópicamente. Se discuten brevemente las perspectivas para la investigación de binarias cerradas que abren las misiones espaciales futuras, como COROT y Eddington.

Keywords

BinariesClose — BinariesEclipsing — Astronomical Data BasesMiscellaneous — Surveys
Type
Instruments, Techniques and Programs, Present and Future
Information
International Astronomical Union Colloquium , Volume 191: The Environment and Evolution of Double and Multiple Stars , August 2004 , pp. 239 - 246
Copyright
Copyright © Instituto de Astronomia – Mexico 2004

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