200NL AK vs 4bet preflop

[Mejis]

No-Limit Hold'em, $2.00 BB (6 handed)

UTG ($207.75) 30/27/4 (150h)
MP ($257.00)
CO ($541.70) 13/8/2 (500h)
Hero ($249.31) 17/15/4 at this table
SB ($309.19)
BB ($458.45) 24/20/3.2 (300h)

Preflop: Hero is Button with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
UTG calls $2, <font color="#666666">1 fold</font>, <font color="#CC3333">CO raises to $10</font>, <font color="#CC3333">Hero raises to $28</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">BB raises to $73</font>, UTG folds, CO folds, Hero ...

probably very standard but I still wasn't sure so I hope anyone takes the time to help me out here. thx