EMB145 CREW HAD A RWY INCURSION TAXIING AT BDL.

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UPON TAXI OUT TO RWY 33 AT BDL CROSSED HOLD SHORT LINE FOR RWY 33. THE ACFT PREVIOUSLY HAD BEEN ON TXWY S. TWR ADVISED US; AFTER WE ANNOUNCED OUR ERROR; THAT WE NEEDED TO CALL THEM WHEN WE REACHED GND IN EWR; AS REGARDS A RWY INCURSION. AS FO; I HAD LOOKED AT ARPT CHART AND GOTTEN GENERAL IDEA OF OUR TAXI RTE. CAPT HAD SAID ALOUD 'TAXI TO RWY 33.' AS WE APCHED INTXN OF RWY 1/19 AND TXWY S; I LOOKED DOWN TO MY ARPT CHART TO GET THE TWR FREQ AND TO VERIFY OUR DEP FREQ FROM OUR CLRNC. AT THIS POINT; THE CAPT INITIATED THE TURN ONTO RWY 1/19 AND; THUS; CROSSED HOLD SHORT LINE FOR RWY 15/33. AT THIS POINT I LOOKED UP AND QUERIED THE CAPT AS TO WHERE HE WAS GOING. THE CAPT PROCEEDED TO BRAKE THE AIRPLANE; BUT THE ACFT WAS PAST THE HOLD SHORT LINE. THEN REALIZING HIS ERROR; HE CONTINUED ACROSS THE RWY IN ORDER TO CLR THE RWY. WE DID VERIFY THE FINAL WAS CLR IN BOTH DIRECTIONS BEFORE XING THE RWY. THERE WERE; AT NO TIME; ANY CONFLICTS WITH OTHER TFC. HUMAN PERFORMANCE CONSIDERATIONS: THE CAPT TOLD ME AFTERWARD THAT HE WAS MISTAKENLY GOING TO RWY 24 NOT RWY 33. THUS; THE REASON FOR BELIEVING HE NEEDED TO CROSS RWY 15/33. THIS WAS DUE TO A PREVIOUS EXPERIENCE WE HAD TAXIING AT BDL. THE EXACT TIME THAT HE STRAYED FROM NORMAL TAXI PATH TO RWY 33 WAS WHEN I LOOKED DOWN TO GET TWR AND DEP FREQ. UNFORTUNATELY; BY THE TIME I CAUGHT HIS ERROR; IT WAS TOO LATE AND THE RWY INCURSION HAD ALREADY OCCURRED. IN HINDSIGHT I SHOULD HAVE CHOSEN A BETTER TIME TO GET THE FREQS I NEEDED. I SHOULD HAVE WAITED UNTIL WE WERE CLR OF THE AREA OF TXWY S; RWY 1/19. ADDITIONALLY I SHOULD HAVE TRUSTED MY INSTINCTS AND GOTTEN ON THE BRAKES MYSELF WHEN I REALIZED THE CAPT'S ERROR. IT ALSO MAY HAVE BEEN HELPFUL IF I WOULD HAVE SAID ALOUD 'TAXI TO RWY 33' TO THE CAPT; IN ORDER TO TOTALLY CONFIRM OUR INSTRUCTIONS. THIS WOULD HAVE BEEN SUPERIOR CRM. I INTEND TO DO THIS FROM NOW ON; REGARDLESS OF THE COMPLEXITY OF TAXI OPS. IT MAY HAVE SERVED WELL FOR THE CAPT TO HAVE SAID 'CLR TO CROSS RWY 15/33'; BEFORE HE INITIATED HIS TURN. THIS WOULD HAVE PREVENTED THIS INCIDENT. LESSON LEARNED: AS FO ON ANY ACFT; ALWAYS BE AWARE OF WHAT YOUR CAPT IS DOING BEFORE HE/SHE DOES IT. SUPPLEMENTAL INFO FROM ACN 571805: WE HAD TO DO A XBLEED START DUE TO AN INOP APU. WE STARTED THE OTHER ENG ON TXWY S. AFTER START; WE MADE A L TURN; AND BY THE TIME WE FIGURED OUT THAT WE WERE GOING THE WRONG WAY; THE NOSE OF THE ACFT HAD CROSSED THE HOLD SHORT LINE OF RWY 33. WE NEED TO STAY ON TOP OF SITUATIONAL AWARENESS AND PAY ATTN!