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We have conducted a feasibility study to determine the effectiveness of usingUSNO-B1.0 data to preferentially detect objects with displaced red and bluecomponents. A procedure was developed to search catalogue entries for suchobjects, which include M dwarfs paired with white dwarfs or with earliermain-sequence stars, and galaxies with asymmetric colour distributions.Residual differences between red and blue and infrared and blue scannedemulsion images define vectors, which, when appropriately aligned and ofsufficient length, signal potential candidates. Test sample sets were analysedto evaluate the effective discrimination of the technique. Over 91,000USNO-B1.0 catalogue entries at points throughout the celestial sphere were thenfiltered for acceptable combinations of entry observations and magnitudes andthe resulting total of about 17,000 entries was winnowed down to a little morethan 200 objects of interest. These were screened by visual examination ofphoto images to a final total of 146 candidates. About one quarter of thesecandidates coincide with SDSS data. Those constituents fall into two groups,single and paired objects. SDSS identified several galaxies in the first group.Regarding the second group, at least half of its members were tentativelyidentified as main-sequence pairs, the greater portion being of widelyseparated spectral types. Two white dwarf--main-sequence pairs were alsoidentified. Most importantly, the vectors formed from USNO-B1.0 residuals werein alignment with corresponding SDSS pair position angles, thereby supportingthis work`s central thesis.

Application of USNO-B1.0 towards selecting objects with displaced blue and red components