my son is currently sentenced to 40 years in california prison his appeal just got denied in the 9th distric,can he i do anything else?

You should seek the advice of an appellate attorney who does federal appeals.  It sounds like this just occurred, the decision by the 9th Circuit Court of Appeals just occurred.  There are deadlines so make sure you seek the advice of an attorney so that they can give notice of appeal to protect your son's ability to appeal.  DO NOT DELAY as there are strict timetables for the right to appeal. Good luck...