FO OF LEAR 31 FAILED TO TURN ON THE CORRECT FINAL DUE TO CONFUSION WITH THE ASSIGNED RWY AND THE OTHER SET OF PARALLEL RWYS RESULTING IN LOSS OF SEPARATION WITH AN EMB120 ON FINAL FOR THE OTHER SET OF PARALLEL RWYS.

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MY FO WAS FLYING THIS LEG FROM THE L SEAT AND WE WERE BEING VECTORED ON A DOWNWIND TO RWY 8R WITH L-HAND TFC AT ATL. THE CTLR ISSUED US A L TURN TO INTERCEPT FINAL FOR A VISUAL TO RWY 8R. HE ALSO CAUTIONED US THAT WE WERE FOLLOWING A HVY JET AND THERE MAY BE WAKE TURB. I ACKNOWLEDGED THE VISUAL APCH CLRNC. HE THEN ISSUED US A TA FOR A BRAZILIA LNDG ON THE PARALLEL TO OUR R. I CALLED THE TFC IN SIGHT AT OUR 3 O'CLOCK POS. THE FO ASKED ME TO TUNE AND SET UP THE ILS FOR RWY 8R FOR HIM. HE WAS CONCERNED ABOUT WAKE TURB AND IT IS OUR POLICY TO FLY A FINAL APCH BEHIND A HVY JET AT LEAST 1 DOT ABOVE GS TO REMAIN ABOVE ITS WAKE. I HAD MY EYES INSIDE THE COCKPIT AT THIS TIME LOOKING FOR THE APCH PLATE FOR RWY 8R AT HIS REQUEST. I THEN TUNED AND IDENTED IT FOR HIM. I LOOKED UP AGAIN TO MY R AND NOTICED THAT THE BRAZILIA WAS CONVERGING WITH US. APCH CTL AGAIN ASKED US TO VERIFY THE ACFT IN SIGHT AND ACKNOWLEDGE OUR VISUAL CLRNC TO RWY 8R. I REPLIED AFFIRMATIVE TO BOTH. THE FO WAS TO INTERCEPT THE ILS LOC AND GS; YET I WAS ASSUMING THAT HE WAS VISUAL. THE VISIBILITY; AFTER ALL; WAS GREATER THAN 10 MI; AND WE HAD ACKNOWLEDGED THE FIELD IN SIGHT. I THEN LOOKED FORWARD AND NOTICED THAT OUR ACFT WAS ON A CONVERGING COURSE FOR RWY 9L. I THEN TOOK CTL AND SAID 'TURN L NOW;' AND WE EXECUTED A 30 DEG BANK TO THE L TO REINTERCEPT FINAL FOR RWY 8R. WE THEN LANDED WITHOUT INCIDENT. THE FO TOLD ME LATER THAT HE WAS UNAWARE THAT THE RWY 8R LOC WAS NOTAMED OTS AND THAT HE THOUGHT RWY 8R WAS ON THE S SIDE; NOT THE N SIDE. AS AN ADDITIONAL NOTE; OUR AIRPLANE IS NOT EQUIPPED WITH TCASII.