NL25: better bet turn on draw heavy board?

[zacman]

Known players: (for a description of vp$ip, pfr, ats, folded bb, af, wts, wsd or hands click here)
<font class="small">Code:</font><hr /><pre>Position(Stack):
vp$ip foldbb ats pfr
af w$sd wts hands



CO (11,81):
16 0 100 15
2,0 40 42 55



SB (12,43):
15 0 0 6
0,6 40 45 67

BU (29,66)
</pre><hr />
0,10/0,25 No-Limit Hold'em <font color="blue">(9 handed)</font>
Hand recorder used for this poker hand: Texas Grabem 1.8 by www.pokerstrategy.cc.

Preflop: Hero is BU with A[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/club.gif[/img]
<font color="grey">5 folds</font>, <font color="red">CO raises to $0,50</font>, Hero calls $0,50, SB calls $0,40, <font color="grey">BB folds</font>.

Flop: ($1,75) 3[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="blue">(3 players)</font>
SB checks, CO checks, <font color="red">Hero bets $1,50</font>, <font color="grey">SB folds</font>, CO calls $1,50.

Turn: ($4,75) 5[img]/images/graemlins/diamond.gif[/img] <font color="blue">(2 players)</font>
CO checks, Hero checks.

River: ($4,75) 2[img]/images/graemlins/club.gif[/img] <font color="blue">(2 players)</font>
<font color="red">CO bets $3,50</font>, Hero calls $3,50.

Final Pot: $11,75

Should I bet the turn here because of the draw heavy board?

I thought he might either have me beat with AK/AQ or he has a pocket pair which he might bet on the river when I check behind, maybe also a worse Ace. I didn't think that a flush draw is as likely?