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CCD Astrometry and Photometry of Visual Double Stars: Northern Hipparcos Wide Pairs Measured in the Years 2003-2005

Published online by Cambridge University Press:  09 August 2007

D. Sinachopoulos ,
P. Gavras ,
Th. Medupe ,
Ch. Ducourant  and
O. Dionatos
D. Sinachopoulos
Affiliation:
National Observatory of Athens, Institute of Astronomy and Astrophysics
P. Gavras
Affiliation:
National Observatory of Athens, Institute of Astronomy and Astrophysics National and Kapodistrian University of Athens, Department of Astronomy, Astrophysics and Mechanics
Th. Medupe
Affiliation:
South African Astronomical Observatory
Ch. Ducourant
Affiliation:
Observatory of the University of Bordeaux
O. Dionatos
Affiliation:
National and Kapodistrian University of Athens, Department of Astronomy, Astrophysics and Mechanics
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Abstract

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The relative positions of Hipparcos visual double star components are currently known with a precision around fifty mas. Modern CCD astrometric observations of these objects achieve an accuracy of their angular separation between ten and twenty mas per observation. New CCD measurements have been obtained at Kryonerion Observatory in the north hemisphere. They provide current relative positions of visual double stars which are at least twice as accurate as the ones provided by Hipparcos. The new measurements will permit us to extract the physical pairs from the sample, and the double stars, which have components of common origin. Final statistics of these systems will improve our understanding of stellar formation and evolution rates of wide binaries in the solar neighborhood.

Keywords

stars: wide double stars: Hipparcos - double stars - visual - astrometry - differential photometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 613 - 618
Copyright
Copyright © International Astronomical Union 2007

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