Double stars remain an important source of troubles, mainly because
indication of the diaphragm used or simply the component observed
is often lacking. Unless otherwise indicated in the literature, we
have assumed that double stars with separation less than 10 seconds
of arc have not been separated and the photometry refers to the joined
luminosity and colours. A strict criterion is difficult to apply since
the limiting separation below which double stars are observed together
has changed with time due to instrument improvement.
We have given an
individual entry to each component (A, B, ...) if they have been measured
separately and an additional one if the magnitude and colours also exist
for the combined systems (AB, AP, ABC, BC, CD, and so on). The multiplicity
is given in the remark column.
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Last update: 7 Novembre 1995