Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..525b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 525-528. Research supported by CICYT and NSF.
Astronomy and Astrophysics
Astrophysics
27
Carbon Monoxide, Neutral Gases, Planetary Nebulae, Rotational Spectra, Spectral Emission, Stellar Winds, Molecular Gases, Red Giant Stars, Stellar Envelopes, Stellar Evolution, Stellar Spectrophotometry
Scientific paper
The detection of CO J=1-0 and J=2-1 emission in two young planetary nebulae BD + 30 deg 3639 and M 1 - 17 is reported. Both show the presence of molecular gas at high velocities compared with the typical winds of red giants. CO emission in BD + 30 deg 3639 is seen over a velocity range of 132 km/s. The 1-0 spectrum shows a single, broad component. The 2-1 spectrum, obtained with a smaller (12 arcsec) beam, shows two narrow components separated by 105 km/s, indicating that the expanding envelope is resolved by the smaller beam. M 1 - 17 is spatially unresolved, but the line profiles show the presence of a fast wind with a velocity extent of 78 km/s, in addition to a more usual slow wind. The mass of the molecular envelope of M 1 - 17 is greater than 0.3 solar mass, at least 10 times the mass of the ionized nebula; that of BD + 30 deg 3639 is less, but it also has substantial envelope of atomic gas. The observations suggest that considerable dynamical evolution of the neutral envelopes can take place before they become ionized at a later stage in the evolution of the nebulae.
Bachiller Rafael
Cox Pierre
Forveille Thierry
Huggins Patrick J.
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