Orbital elements for BU 1240 AB. Nature of the C and D components

 

F. M. Rica Romero^1,2

 

¹ Agrupación Astronómica de Mérida, C/José Ruiz Azorín, 14, 4 D, 06800, Mérida, Spain and

² Liga Iberoamericana de Astronomía (LIADA), Av. Almirante Guillermo Brown, 4998, 3000 Santa Fe, Argentina (frica0@terra.es)

 

Received 2006 October 3
Accepted 2007 December 14

 

RESUMEN

En este trabajo se obtienen nuevos parámetros orbitales para la binaria WDS 05386+3030 = BU 1240 AB debido a la existencia de residuos sistemáticos respecto a las últimas mediciones realizadas con posterioridad a 1985. Se utilizó una combinación de métodos gráneos y analíticos para el cálculo. La órbita preliminar fue mejorada usando el método de corrección diferencial de W. D. Heintz. Se obtuvo la masa. La naturaleza de las componentes C y D fue estudiada usando la fotometría BVIJHK y datos astrométricos y cinemáticos. Determinamos la naturaleza física de C y la óptica de D usando varios criterios.

 

ABSTRACT

New orbital parameters and masses for WDS 05386+3030 = BU 1240 AB were determined prompted by the large residuals seen in recent speckle measurements from 1985. A combined solution of graphical (to determine preliminary parameters) and analytical methods was used. The preliminary orbit was refined using the differential correction method by Heintz. The physical characteristics of the C and D components were studied using BVIJHK photometry, historical astrometry and kinematical data. Several criteria indicate a physical nature for C and an optical nature for D.

Key Words: binaries: general — binaries: visual — stars: individual (HD 37269, ADS 4229)

 

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Acknowledgement

This publication made use of the SIMBAD database and ALADIN tool, operated at the CDS in Strasbourg, France. The author thanks Brian Mason for his valuable advice and important support. The author is specially grateful to Andreas Alzner for the transmission of his knowledge about orbital calculations; without his help and patience I would not have now enough skills and knowledge to calculate orbital parameters for visual double stars.

 

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