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Statistical Properties of Trapezium Systems

Published online by Cambridge University Press:  12 April 2016

Christine Allen ,
Mauricio Tapia  and
Laura Parrao
Christine Allen
Affiliation:
Instituto de Astronomía Universidad Nacional Autónoma de México
Mauricio Tapia
Affiliation:
Instituto de Astronomía Universidad Nacional Autónoma de México
Laura Parrao
Affiliation:
Instituto de Astronomía Universidad Nacional Autónoma de México

Abstract

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A catalogue of more than 900 multiple systems of trapezium type has recently been completed. In constructing the catalogue an attempt was made to exclude optical systems. We study the galactic distribution of trapezia of different spectral types, and we compare it with that of ordinary multiple systems and of visual binaries from the IDS. An estimate is made of the expected number of pseudo-trapezia among each spectral type. This study shows that most of our trapezia are true trapezia and should therefore be young. This conclusion holds for trapezia of all spectral types.

Resumen

Resumen

Hemos obtenido recientemente un catálogo de más de 900 sistemas múltiples de tipo trapecio. Al construir el catálogo se intentó excluir a los sistemas ópticos. Se estudia la distribución galáctica de los trapecios de distintos tipos espectrales y se compara ésta con la de sistemas múltiples ordinarios y binarias visuales del IDS. Se estima el número esperado de pseudotrapecios en cada tipo espectral. Este estudio muestra que la mayor parte de los trapecios son trapecios verdaderos, y por lo tanto, deben ser jóvenes. Esta conclusión es válida para trapecios de todos los tipos espectrales.

Type
Session 4
Information
International Astronomical Union Colloquium , Volume 33: Observational Parameters and Dynamical Evolution of Multiple Stars , May 1977 , pp. 119 - 126
Copyright
Copyright © Otto G. Franz and Paris Pismis 1977

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