UBV absolute CCD photometry and differential astrometry of a sample of visual double stars with A-type primaries

Details UBV absolute CCD photometry and differential astrometry of a sample of visual double stars with A-type primaries UBV absolute CCD photometry and differential astrometry of a sample of visual double stars with A-type primaries

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..139...69s&link_type=abstract

Astronomy and Astrophysics Supplement, v.139, p.69-74

Astronomy and Astrophysics

Astrophysics

4

Stars: Binaries: Visual, Techniques: Photometric, Astrometry

Scientific paper

We present V magnitudes, (B-V) and (U-B) colours of the components of 111 visual double stars and their relative position measurements rho and theta . The primaries are of spectral class A; the angular separation is in the 2farcs5 -8arcsec range. The observations were made at the 61-cm reflector of University of Toronto Southern Observatory, Chile. The obtained photometric results are of a moderate quality for absolute values (0.04() m (mag) in V and about 0.02() m in the (B-V) and (U-B) colour indices) and more precise in Delta V and Delta (U-B), Delta (B-V) (0.023() m and 0.015() m, respectively). We find that about 60% of secondaries are also of spectral type A; 56% of pairs have Delta (B-V) less than 0.1() m. The two-colour diagram reveals significant offset of objects from the curve of unreddened Main Sequence stars. A comprehensive survey of stars in the close vicinity to the objects is also presented. The final astrometric accuracy of ~ 0farcs01 in rho and 0fdg1 in theta provides additional measurements for study of relative motion of the components. Based on observations made at University of Toronto Southern Observatory, Las Campanas, Chile. Tables \arabic{tabptm}--\arabic{tabast} are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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