Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40896c&link_type=abstract
Spitzer Proposal ID #40896
Computer Science
Scientific paper
HR 4049 is the prototype of a class of binary post-AGB stars with very peculiar properties. One of those surprising properties is the presence in the IR spectrum of gas species typically found in O-rich environments (carbon dioxide, water, OH) at the same time as species typical for C-rich environments (HCN, Polycyclic Aromatic Hydrocarbons, nanodiamonds). Moreover, the carbon dioxide bands require an extreme enrichment in 17O and 18O isotopes of nearly 3 orders of magnitude. Previous IR observations have indicated the presence of a massive and vertically extended disk surrounding the entire binary system. This disk is important to explain the peculiar abundance pattern in the stellar photosphere, but may be equally important for understanding the simultaneous occurence of O-rich and C-rich species in this object. Crucial in this context is the nature (O-rich vs C-rich) of the dust disk at the inner rim. Currently available IR observations do not allow to establish the nature of the dust. Here, we propose to observe HR 4049 with Spitzer-IRS using the LH module in order to study the composition of the dust in the circumbinary disk by searching for dust features at wavelengths between 19.3 and 36 micron.
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