There is a ceremony in the south indian marriage where the husband takes the wife and shows her the Arundhati vashishta combination. One popular story is that Arundhati was the dedicated wife of sage Vashistha and that is the reason the wife is shown the arundhati star basically to show her the model wife .
But there is also a scientific explanation for this . The star constellation of Arundhati and Vashishta is one in which one star does not revolve around the other instead they both orbit the same center of mass of theirs, and they travel through the cosmos together . So the star constellation is actually a symbolism of how a husband and wife should be . They should both support each other and travel towards a common goal together instead of one being the center and other serving them all along.