Molecules in NGC 6781 and other ringlike planetary nebulae

Details Molecules in NGC 6781 and other ringlike planetary nebulae Molecules in NGC 6781 and other ringlike planetary nebulae

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356l..59z&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 356, June 20, 1990, p. L59-L62.

Astronomy and Astrophysics

Astrophysics

13

Carbon Monoxide, Hydrogen, Interstellar Matter, Planetary Nebulae, Brightness Distribution, Emission Spectra, Stellar Magnitude, Stellar Spectra, Stellar Structure

Scientific paper

Extended H2 S(1), v = 1-0 and CO J = 1-0 emission has been detected from the ringlike planetary nebula NGC 6781 which, in many respects, appears to be a low surface brightness counterpart of the Ring nebula, NGC 6720. NGC 6781 is the fourth known member of a group of unusual planetary nebulae that display molecular outflows at velocities that are, apparently, considerably greater than the expansion velocity of the ionized gas. CO emission was also detected from NGC 3132 and NGC 6772, ringlike planetary nebulae with previously known H2 emission.

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