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• W2981852466 abstract "We present and analyse 12CO, 13CO and C18O(2-1) ALMA observations of the C1 globule inside the Helix nebula in order to determine its physical properties. Our findings confirm the molecular nature of the globule with a multi-peak structure. The 12CO line has a high optical depth of about 10. The derived 12C/13C ratio of 10 and 16O/18O ratio of 115 are not in agreement with the expected isotopic ratios of carbon-rich AGB stars. Assuming that the 12CO optical depth has been underestimated, we can find a consistent fit for an initial mass of 2 Msol. We obtain a molecular mass of 2x10-4 Msol for the C1 globule, which is much higher than its mass in the literature. Clumping could play a role in the high molecular mass of the knot. The origin of the tail is discussed. Our findings show that the most probable model appears to be shadowing. The kinematics and molecular morphology of the knot are not consistent with a wind-swept model and the photoevaporation model alone is not enough to explain the nature of the globule. We propose an integrated model where the effects of the photoevaporation, the stream and shadowing models are all considered in the tail shaping process." @default.
• W2981852466 created "2019-11-01" @default.
• W2981852466 creator A5010603271 @default.
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• W2981852466 date "2019-10-30" @default.
• W2981852466 modified "2023-10-15" @default.
• W2981852466 title "CO in the C1 globule of the Helix nebula with ALMA" @default.
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• W2981852466 doi "https://doi.org/10.1093/mnras/stz3026" @default.
• W2981852466 hasPublicationYear "2019" @default.
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