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- W3034287110 abstract "The carriers of the 21 and 30,$mu$m emission features in infrared spectra of circumstellar envelopes are a long-standing enigma. In this paper, we present the results of molecular line observations toward two circumstellar envelopes exhibiting the 21 and/or 30,$mu$m features, IRAS,21318+5631 and 22272+5435, aiming at investigating whether they have unusual gas-phase chemistry and searching for possible gas-phase precursor of the carriers of the two dust features. The spectra cover several discrete frequency ranges of 130--164,GHz and 216.5--273,GHz, resulting in a detection of 13 molecular species and isotopologues in each object. Rotation-diagram analysis is carried out to determine the molecular abundances, column densities, and excitation temperatures. We did not discover any molecular species that is unexpected in a normal C-rich star. Nevertheless, there exists subtle difference between their molecular abundances. IRAS,22272+5435 shows stronger SiC$_2$ and HC$_3$N lines and weaker SiS lines than IRAS,21318+5631, presumably suggesting that this 21,$mu$m source is more carbon rich and has experienced a more efficient dust formation. We discuss the potential implications of the results for the carriers of the 21,$mu$m and 30,$mu$m features." @default.
- W3034287110 created "2020-06-19" @default.
- W3034287110 creator A5060725404 @default.
- W3034287110 date "2020-08-03" @default.
- W3034287110 modified "2023-10-13" @default.
- W3034287110 title "Molecular Gas in 21 and 30 <i>μ</i>m Sources: The 2 mm and 1.3 mm Spectra of IRAS 21318+5631 and 22272+5435" @default.
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- W3034287110 doi "https://doi.org/10.3847/1538-4357/ab9b80" @default.
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