Double stars

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