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The Active Phase of the Hot Component of Z Andromedae

Published online by Cambridge University Press:  07 August 2017

T. Fernandez-Castro ,
R. Gonzalez-Riestra ,
A. Cassatella ,
A.R. Taylor  and
E.R. Seaquist
T. Fernandez-Castro
Affiliation:
Planetario de Madrid. Spain
R. Gonzalez-Riestra
Affiliation:
IUE Observatory. Madrid, Spain
A. Cassatella
Affiliation:
I.A.S, CNR. Frascati, Italy
A.R. Taylor
Affiliation:
University of Calgary, Canada
E.R. Seaquist
Affiliation:
University of Toronto, Canada

Extract

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Z Andromeda is considered as the prototype of the symbiotic class. This system behaves essentially as the nearly uncontamined nucleus of a young planetary nebula. The parameters of its hot component (R=0,07 R 0, T > 105 K) show that it lies close to the CSPN in the HR diagram (see Fernández–Castro et al. 1988). During the IUE lifetime (1978 onward), Z And experienced a phase of quiescence followed by an active phase which, starting in April 1984, lasted until about July 1986. Since then the star is recovering its quiescent appearance.

Type
IV. Planetary Nebulae Connection: Evolution from the AGB
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 406
Copyright
Copyright © Kluwer 1993 

References

Fernández–Castro, T., Cassatella, A., Giménez, A. and Viotti, R. 1988, Ap. J. 324, 1016.Google Scholar