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The gas-rich disk of HR 4049: A study of the infrared spectrum

Authors
Publication Date
May 01, 2014
Volume
1594
Issue
1
Pages
157–162
Source
SETI Institute
License
Unknown

Abstract

Here, we present a summary of our analyses of the mid-and near-infrared spectrum of the unusual evolved binary HR 4049. We f nd that the disk is massive (M> 8× 10− 3 M⊙), warm and radially extended. We also report some enrichment in 17 O and 18 O and a comparison of observations from Spitzer-IRS to those obtained by ISO-SWS 10 years earlier reveals that the CO 2 f ux has more than doubled in this time, indicating active and ongoing chemical evolution in the circumbinary disk. Given the high column densities of the gas in the disk, ...

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