The molecular emission of young preplanetary nebulae.
Abstract
Molecular observations are presented of several preplanetary nebulae (PPNe) identified from their peculiar IR spectrum. Detections of (C-12)O and (C-13)O J = 2-1, 1-0 emission in four subjects are reported: IRAS 07134 + 1005, IRAS 17436 + 5003, IRAS 19114 + 0002, and IRAS 19500 - 1709. SiO J = 3-2, 2-1 was detected in IRAS 19114 + 0002; HCN J = 1-0 in IRAS 07134 + 1005, IRAS 17436 + 5003, and IRAS 19500- 1709. Evident signs of a bipolar structure were found in IRAS 19114 + 0002 and IRAS 19500 - 1709. In IRAS 19500 - 1709, wide and relatively intense wings were found in (C-12)O and (C-13)O, which are considered to be produced by a high-velocity bipolar outflow that involves a significant fraction of the total molecular envelope.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1992
- Bibcode:
- 1992A&A...257..701B
- Keywords:
-
- Asymptotic Giant Branch Stars;
- Emission Spectra;
- Planetary Nebulae;
- Stellar Evolution;
- Abundance;
- Astronomical Spectroscopy;
- Carbon Monoxide;
- Far Infrared Radiation;
- Stellar Envelopes;
- Astrophysics