The dust and molecular gas cloud surrounding a planetary nebula - NGC 7027

Details The dust and molecular gas cloud surrounding a planetary nebula - NGC 7027 The dust and molecular gas cloud surrounding a planetary nebula - NGC 7027

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..749t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. 749-755. Research supported by the University of Wyo

Astronomy and Astrophysics

Astronomy

17

Astronomical Spectroscopy, Interplanetary Dust, Molecular Clouds, Molecular Gases, Planetary Nebulae, Radio Astronomy, Abundance, Carbon Stars, Cyanoacetylene, Millimeter Waves, Stellar Composition, Stellar Envelopes, Stellar Evolution

Scientific paper

A search for millimeter-wave emission from nine molecules in the planetary nebula NGC 7027 is conducted: CN, CS, C2H, HC3N, SiS, CO-18, SiCC, CH13/3/OH, and H2CO. A search for the J, K = (1, 1) line of NH3 and the J = 21 - 20 transition of HC7N was undertaken at 1.3 cm. Only the N = 1 - 0 line of CN was positively detected. Limits on integrated line strengths, column densities, and relative abundances are calculated for most of the molecules. Abundances calculated for the planetary nebula are compared with those found for the evolved carbon star, IRC + 10 deg 216. Differences between the apparent chemical compositions of the two objects may be explained by a lower maximum volume density in NGC 7027 and the effect of the radiation field of its central star. An analysis of the extinction in the circumstellar cloud shows that the abundance ratio, dust/CO, has nearly the same value in NGC 7027, a number of highly evolved stars, and diffuse interstellar molecular clouds. This result is not likely to reconcile with abundance predictions made on the basis of purely gas-phase chemistry, and it is likely that gas-grain chemistry is important in many astronomical environments.

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