| Issue |
A&A
Volume 368, Number 2, March III 2001
|
|
|---|---|---|
| Page(s) | 572 - 579 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20010024 | |
| Published online | 15 March 2001 | |
Multicolour observations of nearby visual double stars. New CCD measurements and orbits*
1
Royal Observatory of Belgium, Av. Circulaire 3, 1180 Brussels, Belgium
2
Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Chausse Blvd., 1784 Sofia, Bulgaria e-mail: Anton.Strigachev@oma.be
Corresponding author: P. Lampens, Patricia.Lampens@oma.be
Received:
20
September
2000
Accepted:
15
December
2000
We present multicolour CCD observations of nine nearby visual double stars
obtained in August and September 1999 with the 1.3-m telescope at Skinakas
Observatory.
The results consist of relative positions (epochs, angular
separations and position angles) and differential 
photometry. We
confirm the physical association in eight cases. Previously known orbits do not
match the new data for three systems. Orbits have been recalculated when
sufficient data were available. We principally improve the precision of the
known orbits for three binaries and show the acute lack of precision in two
other cases. In one case, the components are shown to move apart with a linear
relative speed of 0.050´´/yr.
Key words: stars: binaries: visual / stars: fundamental parameters / stars: nearby / techniques: photometric / astrometry
© ESO, 2001
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