Probing the Post-AGB Nature of HD 179821

Details Probing the Post-AGB Nature of HD 179821 Probing the Post-AGB Nature of HD 179821

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001assl..265..413j&link_type=abstract

Post-AGB Objects as a Phase of Stellar Evolution, Proceedings of the Toruń Workshop held July 5-7, 2000. Edited by R. Szczerba a

Astronomy and Astrophysics

Astrophysics

Scientific paper

In spite of recent detailed studies, the nature of HD 179821 IRAS 19114+0002 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 12CO and 13CO lines. We also report the new detection of HCO+ in this object. The 12CO line intensities allow estimations of the mass-loss rate of HD 179821. The comparison between 12CO and 13CO 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.

Affiliated with

Also associated with

No associations

Rating

Probing the Post-AGB Nature of HD 179821 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Probing the Post-AGB Nature of HD 179821, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Probing the Post-AGB Nature of HD 179821 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-952628