Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..130..299s&link_type=abstract
Astronomy and Astrophysics Supplement, v.130, p.299-304
Astronomy and Astrophysics
Astrophysics
Stars: Binaries: Visual, Astrometry
Scientific paper
Differences Delta V of magnitude and Delta (B-V) and Delta (U-B) colours, as well as separations and position angles of 42 relatively close double stars are presented. The selection criteria of our sample are: the relatively small separation (between 2.5 and 5 arcseconds), magnitude difference under 1.25 mag, and mainly G-type primaries. The CCD observations, performed at the 90 cm Dutch telescope at ESO, were made using the Bessel U, B and V filters; the astrometry was done in the V filter only. From the analysis of the photometric data we conclude that 16 binaries in our sample have components with practically the same T_eff, since they have almost the same colours; one binary has components with identical characteristics. We also note the good internal accuracy of the astrometric CCD measurements. Based on observations made at ESO La Silla, Chile.
Dessel van E.
Sinachopoulos Dimitris
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