Mathematics – Logic
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50793b&link_type=abstract
Spitzer Proposal ID #50793
Mathematics
Logic
Scientific paper
Dust disks have been detected around binary post-AGB stars, central stars of planetary nebulae (CSPNs), and white dwarfs (WDs). It is not clear whether some of the dust disks have a common origin and persist through the stellar evolution. To search for connections among these dust disks, we have used archival Spitzer observations to survey 40 resolved planetary nebulae and their central stars. IR excesses indicating the existence of dust disks are found in four CSPNs - in NGC 2346, NGC 2438, NGC 6804, and NGC 7139. To accurately measure the continuum fluxes and to search for spectral features of dust grains, we request IRS and MIPS 24 um observations of these nebulae, while avoiding duplication of the archival data. The IRS observations will allow us to unambiguously separate line and continuum emission components and to search for mineralogical features of dust grains, and the MIPS 24 um observations allow us to extend the SEDs to longer wavelengths for better constraint of the dust temperature and distance from the central star. The results will be used to assess the nature of the IR excess and the origin of the dust, and possible link these dust disks to those around post-AGB stars and WDs.
Bilíkovà Jana
Chu Y.-H. Y.-H.
de Marco Orsola
Gruendl Robert
Rauch Thomas
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