Mathematics – Logic
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20807b&link_type=abstract
Spitzer Proposal ID #20807
Mathematics
Logic
Scientific paper
The interacting binaries known as symbiotics defy easy placement in our picture of binary stellar evolution. It is unresolved if these objects are more akin to recurrent novae or nuclei of PNe. Optical and radio imagery reveal that many symbiotics have extended ionized nebulosities stemming from recent and prior ourbursts. We will use Spitzer to obtain MIPS 24 and 70 micron imagery and IRS SH and LH spectroscopy of seven (7) symbiotics showing nebulosity with extent greater than 10". Our combined spectroscopic and imaging program has the following goals. 1.)From MIPS imagery, we will use the dust emission to more fully delineate the enshrouding ejecta. This will sample ejecta near the symbiotic and also at much greater distances, associated with older outbursts. Morphological comparisons for individual objects will give information on whether the nebulae are analogous to nova shells or PN. 2.) From IRS spectra, we will determine the characteristics of the dust through presence of crystalline silicates and possibly other discrete dust features in the spectrum. 3.) We will use this to ascertain the dust properties, environment, and chemistry at time of dust formation. This will greatly expand our knowledge of how symbiotics contribute to dust and elemental enrichment of the Galactic ISM. We will use the high ionization forbidden lines in IRS spectra and our photoionization modeling to derive the SED and the nature of the hot ionizing source in symbiotics. We will further use photoionization modeling, plus spectral data at other wavelengths, to derive reliable abundances both in the high-ionization region and in the low-ionization emission region giving rise to the rich Fe II spectrum typical of symbiotics. Our three-pronged complementary investigation of mapping morphology, characterizing the dust, and abundance analysis, provides an unprecedented means to determine the physical processes in, and evolutionary phases of, symbiotics.
Bruhweiler Frederick
Eriksson Mattias
McCollum Bruce
Verner Ekaterina
Wahlgren Glenn
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