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Internal Motions of Trapezium Systems

Published online by Cambridge University Press:  22 February 2018

Christine Allen ,
Arcadio Poveda  and
Alejandro Hernández-Alcántara
Christine Allen
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México
Arcadio Poveda
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México
Alejandro Hernández-Alcántara
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México

Abstract

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The separations of the various components of 44 trapezia as a function of time are studied, taking advantage of many new, high precision observations for these objects. A previous study revealed that some systems have components moving with velocities larger than the escape velocity (Allen et al.1974). The present work updates our previous study, extending the observations by about 30 years, and thus allowing an improved determination of the relative transverse motions of the components. The analysis of the new data confirms the conclusions we reached in our previous work: most of the trapezia show the internal motions expected for bound, virialized small clusters, but a few have escaping components. The available observational material lends support to the concept that trapezia are unstable systems with lifetimes of the order of a few million years.

Resumen

Resumen

Estudiamos las separaciones entre las componentes, como función del tiempo, para 44 trapecios, aprovechando observaciones recientes de alta precisión. Un estudio anterior reveló que algunos de estos sistemas tienen componentes en movimiento, con velocidades superiores a la velocidad de escape (Alien et al. 1974). El presente trabajo actualiza nuestro estudio anterior, extendiendo 30 años las observaciones y permitiendo así una mejor determinación de las velocidades transversales relativas de las componentes. El análisis de los nuevos datos nos permite confirmar las conclusiones del trabajo anterior: la mayor parte de los trapecios muestra los movimientos internos esperados para cúmulos pequeños ligados y virializados, pero algunos de ellos tienen componentes que se escapan. Los datos disponibles apoyan el concepto de que los trapecios son sistemas inestables con vidas medias del orden de unos cuantos millones de años.

Keywords

StarsKinematics — Open Clusters and Associations
Type
Astrophysical Processes of Multiple Stars in Clusters
Information
International Astronomical Union Colloquium , Volume 191: The Environment and Evolution of Double and Multiple Stars , August 2004 , pp. 195 - 199
Copyright
Copyright © Instituto de Astronomia – Mexico 2004

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