The first decade of envelope formation of 59 Cygni in the far UV and optical regions. II.

Abstract

Coordinated far-UV and optical observations of 59 Cygni are presented which, together with earlier results, describe the behavior of the entire atmosphere of the star during the first decade of formation and evolution of a new cool H-alpha emitting envelope. The data delineate an entire episode composed of a series of organized changes in the size of the mass outflow from the star, the mass content of the cool H-alpha emitting envelope, and the kinematic behavior of the cool envelope. A net increase in both the mass outflow from the star and the envelope's mass content occurs between the beginning and the end of this episode in a sequence of cyclic changes of the mass outflow from the star, the envelope's velocity distribution, and the envelope mass content. The modeling implications of these patterns are discussed.