A new sample of young Planetary Nebulae

2); (2) Istituto di Fisica e Astronomia; C. Trigilio (1); G. Umana (1); Italy; Italy); L. Cerrigone (1; R.A. Zappala' (2) ((1) Istituto di Radioastronomia CNR; Universita' di Catania

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A new sample of young Planetary Nebulae

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arxiv astro-ph/0310190 v1 pith:WJ3O7KKC submitted 2003-10-07 astro-ph

G. Umana (1) , L. Cerrigone (1 , 2) , C. Trigilio (1) , R.A. Zappala' (2) ((1) Istituto di Radioastronomia CNR , Italy , (2) Istituto di Fisica e Astronomia , Universita' di Catania

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Despite of numerous efforts, the stage from Asymptotic Giant Branch (AGB) to Planetary Nebulae (PN) is a poorly understood phase of stellar evolution. We have therefore carried out interferometric (VLA) observations of a sample of hot post-AGB stars, selected on the basis of their optical and infrared properties. Ten sources, out of the 16 been observed, were detected. This indicates that most of our targets are surrounded by a nebula where the ionization has already started. This definitively determines the evolutionary status of the selected sources and provides us with a unique sample of very young Planetary Nebulae (yPNs).

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