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Some Thoughts on Multiple Stars

Published online by Cambridge University Press:  12 April 2016

David S. Evans
David S. Evans*
Affiliation:
Department of Astronomy, University of Texas, Austin and McDonald Observatory

Abstract

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The occultation and spectroscopic approaches to the discovery of multiple stars are reviewed, and the technique of spectroscopic measurement recapitulated. A notation for multiple stars is proposed. An examination of the gravitational interaction levels suggests an average value of ∆ log P for one hierarchical step close to 3.0 and ∆ log a near 2.0 consistent with a binding ratio near 1 : 10000. The distribution for B stars seems to differ from other types and it is conjectured that they cannot be old enough to be residues of clusters. In general few multiple systems seems to show evidence of age sufficient for advanced evolution of the components.

Resumen

Resumen

Se ha hecho una reseña de los métodos para el descubrimiento de estrellas múltiples por medio de ocultación y espectroscopia y de la técnica de mediciones espectroscópicas. Se propone una notación para estrellas múltiples. Un examen de los niveles de interacción gravitational sugieren un valor promedio de ∆ log P para un paso jerárquico cercano a 3 y para ∆ log a cercano a 2.0, consistente con una razón de amarre cerca de 1:10000. La distribución para las estrellas B parece ser diferente a la de otros tipos y se conjetura que ellas no pueden ser lo suficientemente viejas para ser residuos de cúmulos. En general, pocos sistemas múltiples parecen mostrar evidencia de una edad suficiente, como para que presenten una evolución avanzada las componentes.

Type
Session 1
Information
International Astronomical Union Colloquium , Volume 33: Observational Parameters and Dynamical Evolution of Multiple Stars , May 1977 , pp. 13 - 20
Copyright
Copyright © Otto G. Franz and Paris Pismis 1977

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