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• W2570299906 abstract "High spectral resolution mid-IR observations of ethylene () toward the AGB star IRC+10216 were obtained using the Texas Echelon Cross Echelle Spectrograph (TEXES) at the NASA Infrared Telescope Facility (IRTF). 80 ro-vibrational lines from the 10.5 μm vibrational mode with J ≲ 30 were detected in absorption. The observed lines are divided into two groups with rotational temperatures of 105 and 400 K (warm and hot lines). The warm lines peak at ≃ −14 km s−1 with respect to the systemic velocity, suggesting that they are mostly formed outwards from . The hot lines are centered at −10 km s−1 indicating that they come from a shell between 10 and . 35% of the observed lines are unblended and can be fitted with a code developed to model the emission of a spherically symmetric circumstellar envelope. The analysis of several scenarios reveals that the abundance relative to H2 in the range 5−20R⋆ is on average and it could be as high as 1.1 × 10−7. Beyond , it is 8.2 × 10−8. The total column density is (6.5 ± 3.0) × 1015 cm−2. is found to be rotationally under local thermodynamical equilibrium (LTE) and vibrationally out of LTE. One of the scenarios that best reproduce the observations suggests that up to 25% of the molecules at could condense onto dust grains. This possible depletion would not significantly influence the gas acceleration although it could play a role in the surface chemistry on the dust grains." @default.
• W2570299906 created "2017-01-13" @default.
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• W2570299906 date "2017-01-31" @default.
• W2570299906 modified "2023-10-06" @default.
• W2570299906 title "The Abundance of C₂H₄in the Circumstellar Envelope of IRC+10216" @default.
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• W2570299906 doi "https://doi.org/10.3847/1538-4357/835/2/196" @default.
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