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Statistical Properties of an Unbiased Sample of F7-K Binaries: Towards The Long-Period Systems

Published online by Cambridge University Press:  22 February 2018

A. Eggenberger ,
J.-L. Halbwachs ,
S. Udry  and
M. Mayor
A. Eggenberger
Affiliation:
Geneva Observatory, Sauverny, Switzerland
J.-L. Halbwachs
Affiliation:
Observatoire Astronomique de Strasbourg, France
S. Udry
Affiliation:
Geneva Observatory, Sauverny, Switzerland
M. Mayor
Affiliation:
Geneva Observatory, Sauverny, Switzerland

Abstract

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We have undertaken a new investigation of the statistical properties of main-sequence binaries, which is a revision and extension of the Duquennoy & Mayor survey of solar-type stars. The analysis has been divided into two parts: the spectroscopic binaries with periods shorter than 10 years, and the long-period systems including visual binaries and common proper motion pairs. In this contribution we present preliminary results regarding the intrinsic mass ratio and period distributions of visual binaries. Our results are strongly limited by small-number statistics, but when combined with the ones found for the spectroscopic binaries, the following results are obtained: (i) the excess of equal-mass binaries, if still present, is less important for long-period systems than for the binaries with P < 50 days; (ii) the period distribution is inconsistent with a flat distribution.

Resumen

Resumen

Hemos iniciado una investigación sobre las propiedades estadísticas de las binarias de secuencia principal, que revisa y extiende el sondeo de Duquennoy & Mayor para estrellas de tipo solar. El analisis se divide en dos partes: las binarias espectroscópicas con períodos menores que 10 años y las binarias de largo período, incluyendo los pares visuales y los de movimiento propio común. Presentamos resultados preliminares sobre el cociente de masas intrínseco y sobre la distributión de períodos de las binarias visuales. Nuestros resultados están limitados por la estadística de números pequeños, pero combinándolos con los encontrados para las binarias espectroscópicas se obtiene los siguiente: (i) el exceso de binarias de igual masa es menos importante para los sistemas de largo período que para las binarias con P < 50 días; (ii) la distribución de períodos es inconsistente con una distributión plana.

Keywords

BinariesGeneral — BinariesVisual
Type
Observational properties and Statistics of Binary Stars in the Field
Information
International Astronomical Union Colloquium , Volume 191: The Environment and Evolution of Double and Multiple Stars , August 2004 , pp. 28 - 32
Copyright
Copyright © Instituto de Astronomia – Mexico 2004

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