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000001919 005__ 20160701171655.0
000001919 0247_ $$2DOI$$a10.1051/0004-6361:20010570
000001919 037__ $$aASTROimport-76
000001919 100__ $$aLampens, P.
000001919 245__ $$aCCD photometry and astrometry for visual double and multiple stars of the HIPPARCOS catalogue III. CCD photometry and differential astrometry for 253 southern ``intermediate'' systems
000001919 260__ $$c2001
000001919 520__ $$aWe present new astrometric and photometric data for 253 visual double stars of the ``intermediate'' class, i.e. with angular separations in the range 1 to 15 arcsec. The multi-colour observations were obtained in 1992-94 as part of the ESO Key Programme ``Visual Double Stars'' performed at La Silla Observatory (Chile). Differential magnitudes and colours have been secured in a systematic way while component magnitudes and colour indices have been determined in the V and I passbands of the Cousins standard system in good photometric conditions only. Internal and mean external errors are smaller than respectively 0.01 mag and a few hundreths of a magnitude (typically less than 0.03 mag). Relative positions are obtained as a by-product with internal errors of the order of 0.006 arcsec in angular separation (corresponding to pixel width x 0.02) and 0.07 degr in position angle. Final accuracies are thoroughly discussed: we illustrate the overall excellent quality of the data and estimate the quality degradation for angular separations barely larger than the width of the seeing disk. Based on observations made at La Silla (ESO, Chile, Key Programme 7-009-49K). 
000001919 700__ $$a Oblak, E.
000001919 700__ $$a Duval, D.
000001919 700__ $$a Chareton, M.
000001919 773__ $$c132-150$$pAstronomy and Astrophysics$$v374$$y2001
000001919 85642 $$ahttp://esoads.eso.org/abs/2001A%26A...374..132L
000001919 905__ $$apublished in
000001919 980__ $$aREFERD