The molecular envelopes of evolved planetary nebulae

Details The molecular envelopes of evolved planetary nebulae The molecular envelopes of evolved planetary nebulae

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..511h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Aug. 1990, p. 511-517.

Astronomy and Astrophysics

Astronomy

36

Carbon Monoxide, Ionized Gases, Molecular Gases, Planetary Nebulae, Stellar Envelopes, Emission Spectra, Millimeter Waves, Stellar Mass

Scientific paper

CO mapping observations are reported for three evolved planetary nebulae: NGC 7293, NGC 6720, and NGC 6072. Each has a substantial molecular envelope whose structure reflects the morphology of the ionized nebula. In the nearest, NGC 7293, which can be studied in most detail, the molecular gas is closely associated with the optical double-ring system, the kinematics show distinct though incomplete shell structures, and the gas is fragmented on the smallest size scales observed. The mass of molecular gas in these objects is comparable to or exceeds the mass of ionized gas.

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