Molecular envelope of the planetary nebula NGC 7027

Details Molecular envelope of the planetary nebula NGC 7027 Molecular envelope of the planetary nebula NGC 7027

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..522d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 10, 1990, p. 522-529.

Astronomy and Astrophysics

Astrophysics

40

Molecular Clouds, Planetary Nebulae, Stellar Envelopes, Abundance, Interstellar Matter

Scientific paper

Strong emission of HCO(+) J = 1-0 has been detected in the molecular envelope of planetary nebula NGC 7027. A modeling of the envelope including a balance of thermal heating and cooling of the gas leads to a mass-loss rate of 0.0003 solar mass/yr, and the abundances of CO, HCO(+), and HCN of 0.0001, 3 x 10 to the -8th, and 0.9 x 10 to the -8th per H2, respectively. It is suggested that the large observed abundance of HCO(+) can be explained either by the ionization due to soft X-rays from the central star or a high gas-dust heat exchange rate.

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