Issue |
A&A
Volume 374, Number 1, July IV 2001
|
|
---|---|---|
Page(s) | 132 - 150 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20010570 | |
Published online | 15 July 2001 |
CCD photometry and astrometry for visual double and multiple stars of the HIPPARCOS catalogue*
III. CCD photometry and differential astrometry for 253 southern "intermediate" systems
1
Koninklijke Sterrenwacht van België, Ringlaan 3, 1180 Brussel, Belgium e-mail: patricia.lampens@oma.be
2
Observatoire de Besançon, 41 bis, avenue de l'Observatoire, BP 1615, 25010 Besançon Cedex, France e-mail: oblak@obs-besancon.fr
Corresponding author: P. Lampens, patricia.lampens@oma.be
Received:
26
June
2000
Accepted:
11
April
2001
We present new astrometric and photometric data for 253 visual double stars
of the "intermediate" class, i.e. with angular separations in the range 1
to 15 arcsec. The multi-colour observations were obtained in 1992-94 as part of
the ESO Key Programme "Visual Double Stars" performed at La Silla Observatory (Chile).
Differential magnitudes and colours have been secured in a systematic way while
component magnitudes and colour indices have been determined in the V and I passbands
of the Cousins standard system in good photometric conditions only. Internal and
mean external errors are smaller than respectively 0.01 mag and a few
hundreths of a
magnitude (typically less than 0.03 mag). Relative positions
are obtained as a by-product with internal errors of the order of 0.006´´in angular
separation (corresponding to pixel width ) and 0.07°in position angle. Final accuracies are thoroughly
discussed: we illustrate the overall excellent quality of the data and estimate the quality
degradation for angular separations barely larger than the width of the seeing disk.
Key words: techniques: photometric / astrometry / stars: imaging / stars: binaries: visual / stars: fundamental parameters
© ESO, 2001
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