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The Active Phase of the Hot Component of Z Andromedae

  • T. Fernandez-Castro (a1), R. Gonzalez-Riestra (a2), A. Cassatella (a3), A.R. Taylor (a4) and E.R. Seaquist (a5)...

Extract

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.

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References

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

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