Emmanuelle Beart can hardly be accused of hiding herself. Her naked dancing in Claude Berri's 1986 film "Manon des Sources" made her a star. As an artist's model in Jacques Rivette's 1991 "Divertimento," she was inspected nude at length. Yet her screen image is one of mystery. Behind her large melancholy eyes, high cheekbones and fleshy lips, who is she? Alan tries to discover in the New York Times.