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Observational Properties of Synthetic Visual Binary

  • P. Nurmi (a1)

Abstract

Forthcoming astrometric missions will observe a huge number of new binaries from which a large fraction will be visual binaries. Detailed planning of optimal detection procedures requires pre-launch information about the observational properties of expected visual binaries. Hence, a synthetic binary catalog is created and analyzed for observational properties of visual binary stars. These results help to understand what kind of binaries we expect to find in the final output catalogs of astrometric missions. These results represent ‘true’ binary distributions if all of them would be observed. All real observational projects or astrometric satellites sample only small fractions of these populations depending on the observational capabilities of the missions. In this study we consider only relative numbers with respect to the total number of binary stars assumed to exist in the sky down to the magnitude limit depending on the astrometric mission.

Resumen

Las misiones astrométricas futuras observarán un gran nùmero de nuevas binarias de las cuales muchas serán binarias visuales. Para planear detalladamente los mejores procedimientos para su detección es necesario tener información previa sobre las propiedades observacionales de las binarias visuales esperadas. Por ello, se ha creado y analizado un catálogo de binarias sintéticas. Los resultados nos ayudan a entender los tipos de binarias que se espera encontrar en los catálogos que generarán las misiones astrométricas. Estos resultados representan distribuciones “reales” si todas las binarias fueran observadas. Cualquier proyecto observacional real, al igual que cualquier misión astrométrica, muestrea sólo una pequeña fracción de la población real, dependiendo de la capacidad de observación de la misión. En este estudio consideramos solo números relativos con respecto al número total de binarias que se supone que existen en el cielo hasta una magnitud límite, dada por la misión astrométrica.

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References

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Duquennoy, A., & Mayor, M. 1991, A&A, 248, 485
Hurley, J.R., Pols, O.R., & Tout, C.A., 2000, MNRAS, 315, 543
Kroupa, P. 2002, Science, 295, 82
Nurmi, P., & Boffin, H.M.J. 2003, A&A, 408, 803

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Observational Properties of Synthetic Visual Binary

  • P. Nurmi (a1)

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