Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..247b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 1, Feb. 1991, p. 247-255. CICYT-supported research.
Astronomy and Astrophysics
Astrophysics
25
Carbon Monoxide, Interstellar Matter, Late Stars, Planetary Nebulae, Protoplanets, Carbon 12, Carbon 13, Molecular Excitation, Photodissociation, Rotational Spectra, Stellar Temperature
Scientific paper
Millimeter wave emission observations of (C-12)O and (C-13)O in four southern protoplanetary nebulae (PPN), the Boomerang Nebula, Hen 401, Mz3, and Roberts 22, are reported. (C-12)O is detected for the first time in all four sources, and (C-13)O is detected in the Boomerang Nebula. The data are analyzed using a molecular excitation and emission model, and the results indicate that objects with higher stellar temperature tend to present a smaller CO abundance, probably due to the photodissociation of molecules by stellar UV. The total molecular mass of the PPN is found to range from 0.2 to 0.5 solar mass. The mass loss rates responsible for nebula formation are therefore high enough to explain the post-AGB evolution of the objects.
Bachiller Rafael
Bujarrabal Valentin
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