Based on observations made Haute-Provence and Pic du Midi Observatories (France).

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Table 1 is also 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/cgi-bin/qcat?J/A+A/407/31

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... database

The NASA/IPAC Extragalactic Database (NED) is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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... IRAF

IRAF is distributed by the National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.

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...

Table 1 is also available in electronic form at the CDS via anonymous ftp cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/407/31

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... Catalogue

The University of Minnesota Automated Plate Scanner; theO-band is the characteristic band of the blue plates of the First Palomar Sky Survey (Minkowski & Abell 1963).

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... site

http://aps.umn.edu/Docs/photometry.aps.html

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... guide''

http://heasarc.gsfc.nasa.gov/docs/asca/abc/abc.html

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