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The Mass Distribution of Secondaries to Solar-Type Stars

Published online by Cambridge University Press:  22 February 2018

Helmut A. Abt
Affiliation:
Kitt Peak National Observatory, Tucson, AZ, USA
Daryl W. Willmarth
Affiliation:
Kitt Peak National Observatory, Tucson, AZ, USA

Abstract

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Two previous studies of the secondary mass function in spectroscopic binaries by Abt & Levy (1976) and by Duquennoy & Mayor (1991) are shown to be in good agreement if they are both plotted with the same abscissa scale. A new study of 271 main-sequence stars later than F6 V made with a radial-velocity accuracy of ±0.10 km s-1 yielded 10 new sets of orbital elements in addition to the 59 published ones. The resulting secondary mass function is nearly flat and shows that 2.2±1.5% of the primaries have low-mass (0.01–0.10 M) companions. In contrast, the secondary mass function for visual binaries with separations >500 AU fits a van Rhijn function, as was shown previously by Abt and Levy.

Resumen

Resumen

Se muestra que dos estudios previos sobre la distribución de las masas de las secundarias de las binarias espectroscópicas (Abt & Levy 1976; Duquennoy & Mayor 1991) concuerdan bien si ambos se grafican con la misma escala en las abscisas. Un nuevo estudio de 271 estrellas de la secuencia principal más tardías que F6 V, realizado con una precisión en las velocidades radiales de ±0.10 km s −1 nos permitió obtener elementos orbitales para 10 sistemas nuevos, además de los 59 ya publicados. La función de masa para las secundarias que resulta es casi plana, y muestra que 2.2±1.5% de las primarias tienen compaiieras de baja masa (0.01−0.10 M). En contraste, la función de masa de las compañeras de las binarias visuales con separaciones > 500 AU se ajusta a la función de van Rhijn, como lo demostraron Abt y Levy con anterioridad.

Type
Observational properties and Statistics of Binary Stars in the Field
Copyright
Copyright © Instituto de Astronomia – Mexico 2004

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