Nonsteady objects associated with star-forming regions. Relationship to stellar associations, infrared sources, and water masers

The relationship of stellar associations, IRAS point sources, and water masers with two types of objects, which were discovered primarily at Byurakan, is investigated. They are cometary nebulae and Herbig-Haro (H-H) objects. It is shown that almost all of these objects are affiliated with OB or T associations. Two groupings of nonsteady objects have been found. They may belong to unknown T associations. About half of the cometary nebulae and H-H objects were found to be affiliated with IRAS point sources; 22% of the H-H objects and 8% of the cometary nebulae are associated with water masers. Translated from Astrofizika, Vol. 41. No. 4, pp. 585–598, October–December, 1998.