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- W1668571421 abstract "In spite of recent detailed studies, the nature of HD 179821 is still puzzling. It is classified either as an intermediate-mass post-AGB star or as a massive supergiant. We analyze here new high sensitivity radio observations of its circumstellar envelope in the 12C0 and 13CO lines. We also report the new detection of HCO+ in this object. The12C0 line intensities allow estimations of the mass-loss rate of HD 179821. The comparison between 12CO and13C0 lines indicates an isotopic ratio of at most 5. Such a low value is characteristic of (post-)AGB stars with low-mass progenitors. Furthermore, the HCO+ molecular ion indicates that an active photochemistry occurs in the envelope of HD 179821, probably induced by UV photons emitted as the central post-AGB star warms up." @default.
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- W1668571421 date "2001-01-01" @default.
- W1668571421 modified "2023-10-01" @default.
- W1668571421 title "Probing the Post-AGB Nature of HD 179821" @default.
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- W1668571421 doi "https://doi.org/10.1007/978-94-015-9688-6_65" @default.
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