from above wiki
The three gods, their stars and their attributes
The star of Fu (福), Fuxing 福星, refers to the planet Jupiter. In traditional astrology, the planet Jupiter was believed to be auspicious. Alternatively, according to a Taoist myth of the Ming dynasty, the Fu star is associated with Yang Cheng, a governor of Daozhou in Western Han (206 BC - 24 AD). Yang Cheng risked his life by writing a memorial to the emperor to save the people from presenting dwarf slaves as the special tribute to the imperial court. After his death, the people built a temple to commemorate him, and over time he came to be considered the personification of good fortune.
He is generally depicted in scholar's dress, holding a scroll, on which is sometimes written the character "Fu". He may also be seen holding a child, or surrounded by children. He is sometimes conflated with Caishen, the "Wealth God".
The star of Lu (禄), Luxing 禄星, is ζ Ursa Majoris, or, in traditional Chinese astronomy, the sixth star in the Wenchang cluster, and like the Fu star came to be personified. The Lu star is believed to be Zhang Xian who lived during the Later Shu dynasty. The word lu specifically refers to the salary of a government official. As such, the Lu star is the star of prosperity, rank, and influence.
The Lu star was also worshipped separately from the other two as the deity dictating one's success in the imperial examinations, and therefore success in the imperial bureaucracy. The Lu star is usually depicted in the dress of a mandarin.
The star of Shou (壽), Shouxing 寿星, is α Carinae (Canopus), the star of the south pole in Chinese astronomy, and is believed to control the life spans of mortals. According to legend, he was carried in his mother's womb for ten years before being born, and was already an old man when delivered. He is recognized by his high, domed forehead and the peach which he carries as a symbol of immortality. The longevity god is usually shown smiling and friendly, and he may sometimes be carrying a gourd filled with the elixir of life. He is sometimes conflated with Laozi and corresponding gods of Taoist theology.