ACR ON APCH ON STAR HAS TCASII TA. SIGHT TFC AND DELAY PUBLISHED TURN TO AVOID CONFLICT.

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CAPT WAS FLYING BLUE RIDGE 3 ARR INTO DFW; I (2ND PLT) WAS COORDINATING WITH COMPANY ON RADIO AND BRIEFING PAX AND FLT ATTENDANTS. AT A POINT APPROX 30 MI FROM BLUE RIDGE VOR ON THE 230 DEG RADIAL JUST PRIOR TO MAKING 170 DEG TURN ON THE PUBLISHED STAR; TCASII GAVE A TA AT 8 MI; SAME ALT; APPROX 10 O'CLOCK. AT THIS POINT I WAS OFF THE RADIO LOOKING WITH JUMPSEAT OCCUPANT FOR TFC. CAPT TURNED SLIGHTLY R OF THE 230 DEG RADIAL (BUJ) WHEN WE ALL PICKED UP TFC VISUALLY AT 10-11 O'CLOCK; SAME ALT. IT WAS IN OUR OPINION THAT IF WE HAD MADE THE 170 DEG TURN AS PUBLISHED; THERE WOULD HAVE BEEN A SERIOUS CONFLICT. MY CONCERN WAS THAT APCH CTL HAD NO ACKNOWLEDGEMENT OF THE TFC AND WE HAD TO DEVIATE FROM THE PUBLISHED STAR. WHEN WE TOLD CTL OF THE PLANE HE DID NOT CONFIRM AN INTRUDER AND WE ENDED UP OVER THE DFW ARPT; PAST THE PUBLISHED TURN POINT. ALL 3 PLTS MADE VISUAL CONTACT WITH THE ACFT IN QUESTION; AND IT WAS OUR OPINION THAT DELAYING THE TURN ON THE STAR INCLUDED EVASIVE ACTION TO AVOID THE ACFT.