Atar is the son of Ahura Mazda. and is the equivalent of Vulcan according to the Catholic Encylopedia. If so he would be the equivalent of Tvastri in the Hindu tradition. Atar-Samain (i.e. Ishtar of the heavens). Cited from website Ash-Astarte Persian God of Fire and Purity http://www.pantheon.org/articles/a/atar.html cf. Faridun (Thraetona) ADAR: Fire; name of an angel. Av. Atar, Pahl. Atur