Didn't like the way I played this A8s

[kitaristi0]

I wasn't paying attention to this table (I have only recently discovered how much fun 2-7 Triple Draw on UB really is), so no reads. I wasn't really thinking about the hand when playing either.

If I had to play this hand again, I would fold PF and/or check/fold flop. However, as played, what do I do on this turn? Note that button only has $7.60 left.

Ultimate Bet No-Limit Hold'em, $.50 BB (5 handed) FTR converter on zerodivide.cx

Hero ($58.90)
MP ($48.85)
Button ($13.35)
SB ($75.15)
BB ($17.80)

Preflop: Hero is UTG with A[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises to $1.75</font>, <font color="#666666">1 fold</font>, Button calls $1.75, <font color="#666666">1 fold</font>, BB calls $1.25.

Flop: ($5.50) 4[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets $4</font>, Button calls $4, BB folds.

Turn: ($13.50) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero ?