Protecting a flopped straight

[12ozLongneck]

CO had seen 60% of flops and was fairly aggressive postflop. Was the check-raise the correct play or should I have gone ahead and bet out on the flop?

Party Poker 0.5/1 Hold'em (10 handed) converter

Preflop: Hero is UTG with K[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/club.gif[/img].
Hero calls, UTG+1 folds, UTG+2 folds, MP1 calls, MP2 folds, MP3 calls, CO calls, Button folds, SB folds, BB checks.

Flop: (5.50 SB) Q[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, Hero checks, MP1 checks, MP3 checks, <font color="#CC3333">CO bets</font>, BB folds, <font color="#CC3333">Hero raises</font>, MP1 folds, MP3 folds, CO calls.

Turn: (4.75 BB) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, CO calls.

River: (6.75 BB) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, CO folds.

Final Pot: 7.75 BB