Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40115f&link_type=abstract
Spitzer Proposal ID #40115
Physics
Scientific paper
Wolf-Rayet central stars of planetary nebulae are rare H-deficient stars. The mid-infrared spectra of planetary nebula central stars of late WC type ([WC8-12]) reveal dual dust chemistry: polycyclic aromatic hydrocarbons and crystalline silicates and water ice. We will use the Spitzer Space Telescope to help answer a fundamental question about planetary nebulae containing Wolf-Rayet stars: do all these nebulae show the simultaneous presence of carbon- and oxygen-rich molecules and dust in their MIR spectra, regardless of stellar spectral type, and does this phenomenon relate to the evolution of these planetaries? We will address this question through IRS low- and high-resolution spectra of the nebulae and their stars spanning the full range of Wolf-Rayet spectral types of the central stars. To interpret the nebular slit spectra we will image the PNe with IRAC in HDR mode. Well-calibrated spectra will help to understand the origin of these rare nebulae and may indicate whether evolution alone dictates their morphology, spectral energy distributions, dust band strengths, mass-loss history, and the mid-infrared spectra of their central stars.
Barlow Michael
Cohen Martin
Crowther P. P.
Fazio Giovanni
Hora Joseph
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