A senior citizen was assaulted Wednesday in the parking lot of BJ’s Wholesale Club on Route 1, Dedham police said Thursday. The man was attacked in his vehicle and robbed around 3 p.m., according BJ’s spokeswoman Kelly McFalls. The man was coherent enough to speak to authorities when they arrived, she said. The incident is under investigation.Haven Orecchio-Egresitz can be reached at Haven.firstname.lastname@example.org. Follow her on Twitter @HavenTaylor.