CRL 2688: a post-carbon-star object and probable planetary nebula progenitor.
Abstract
Observations are reported for millimeter-wavelength emission toward CRL 2688 from H(C-12)N, H(C-13)N, CS, and HC3N. The similarity of this emission and that from the molecular envelope of the carbon star IRC +10216 establishes, beyond a reasonable doubt, that CRL 2688 is a post-carbon-star object. It appears probable that both of these objects will evolve into planetary nebulae. An evolutionary sequence leading from carbon stars to planetary nebulae is outlined.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1976
- DOI:
- 10.1086/182080
- Bibcode:
- 1976ApJ...205L..15Z
- Keywords:
-
- Carbon Compounds;
- Carbon Stars;
- Giant Stars;
- Infrared Spectra;
- Molecular Spectra;
- Planetary Nebulae;
- Stellar Evolution;
- Cyanoacetylene;
- Hydrocyanic Acid;
- Infrared Astronomy;
- Millimeter Waves;
- Stellar Envelopes;
- Astrophysics