Radio and Infrared observations of Transition Objects

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dc.creatorCerrigone, L.
dc.creatorHora, J. L.
dc.creatorUmana, G.
dc.creatorTrigilio, C.
dc.date2007-08-30
dc.date.accessioned2026-07-07T08:26:51Z
dc.date.available2026-07-07T08:26:51Z
dc.descriptionObserving objects in transition from pre- to young Planetary Nebula (PN), when the central star radiation starts to excite the envelope, can help us to understand the evolution of the circumstellar ejecta and their shaping mechanism/s. In our project we have selected a sample of hot post-AGB stars as Transition Phase candidates. Radio observations have led to detect free-free radiation from an ionized shell in about half of our targets, providing us with two sub-samples of ionized and non ionized Transition Objects. We are now using IRAC and IRS on the Spitzer Space Telescope to determine if extended emission is present (IRAC) and to study our targets' chemistry (IRS). In particular, by comparing spectra from the two sub-samples, the IRS observations will enable us to check how the presence of an ionization front effects the circumstellar envelope. The IRAC measurements, combined with previous ones in the literature, will give us information on the extent and physical conditions of the dust components.
dc.description8 pages, 8 figures, contribution to the conference Asymmetrical Planetary Nebulae IV
dc.identifierhttps://arxiv.org/abs/0708.4246
dc.identifierhttp://arxiv.org/abs/0708.4246
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/137080
dc.subjectAstrophysics
dc.titleRadio and Infrared observations of Transition Objects
dc.typetext

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