J/A+AS/139/425 J/A+AS/139/425 CCD Photometry and Astrometry of Double Stars J Cuypers W Seggewiss Astron. Astrophys. Suppl. Ser. 139 425 1999 1999A&AS..139..425C I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Oblak et al., Paper I. 1999A&A...346..523O Stars, double and multiple Photometry, CCD stars: binaries: visual astrometry We present photometric and astrometric data of about 280 visual double stars of the "intermediate" class, i.e. with angular separations mainly in the range 2"<{rho}<12". The observations have been obtained in 1991-92 with a CCD camera attached to the 91cm Dutch telescope at ESO La Silla, Chile. Differential magnitudes of the double star components as well as magnitudes and colour indices of the individual components have been determined in the Cousins V and I passbands with an internal error of about 0.005mag and an external accuracy of less than 0.03mag. In addition, angular separations have been secured to an internal accuracy of 0.004" and position angles to about 0.05{deg}.

Hipparcos

Name Star designation --- Note1 Standard type number=1 a: Astrometric standard p: Photometric standard --- Date Date of observation (Besselian year) yr Note2 Note to table1.dat number=2 *: more than one sequence of measurements (see Table 2) --- Nobs Total number of observations --- rho Mean separation arcsec e_rho Standard error of the mean separation arcsec theta Mean position angle deg e_theta Standard error of the mean position angle deg rVI Distance between the V and I parameters arcsec rNH Distance between this observation and the corresponding Hipparcos (Cat. <I/239>) result arcsec o_Vmag Number of observations in filter V --- DVmag Magnitude difference between component A and B in (instrumental) V mag e_DVmag Standard error of the mean magnitude difference between component A and B in (instrumental) V mag o_Imag Number of observations in filter I --- DImag Magnitude difference between component A and B in (instrumental) I mag e_DImag Standard error of the mean magnitude difference between component A and B in (instrumental) I mag Name Star designation --- Note1 Strandard type number=1 a: Astrometric standard p: Photometric standard --- JD Julian date (2440000+) d Note2 Note to table3.dat number=2 *: more than one sequence of measurements (see Table 4) --- VmagA V magnitude of component A mag e_VmagA Standard error of the mean on V magnitude of component A mag VmagB V magnitude of component B mag e_VmagB Standard error of the mean on V magnitude of component B mag DVmag Magnitude difference between component A and B in V mag o_Vmag Number of observations in filter V --- V-IA Colour index V-I of component A mag e_V-IA Standard error of the mean of the colour index of component A mag V-IB Colour index V-I of component B mag e_V-IB Standard error of the mean of the colour index of component B mag o_Imag Number of observations in filter I --- DV-I Colour index V-I difference between component A and B mag Patricia Bauer CDS 1999Sep07Jan Cuypers <Jan.Cuypers@oma.be> J_A+AS_139_425.xml