Molecular envelope of the planetary nebula NGC 7027

Journal Article · Thu Mar 01 00:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168490· OSTI ID:6917797

Deguchi, S; Izumiura, H; Kaifu, N; Mao, X; Nguyen-q-rieu, M ^[1]

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1. Nobeyama Radio Observatory, Minamimaki (Japan) Paris, Observatoire, Meudon (France) Tokyo Univ. (Japan) Beijing Normal Univ. (China)

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. 44 refs.

• OSTI ID: 6917797
• Journal Information: Astrophysical Journal; (USA), Vol. 351; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PLANETARY NEBULAE
CHEMICAL COMPOSITION
MORPHOLOGY
COOLING
COSMIC GASES
ELEMENT ABUNDANCE
EMISSION SPECTRA
HEAT TRANSFER
HEATING
INTERSTELLAR SPACE
IONIZATION
MASS TRANSFER
MATHEMATICAL MODELS
MOLECULES
SOFT X RADIATION
ABUNDANCE
ELECTROMAGNETIC RADIATION
ENERGY TRANSFER
FLUIDS
GASES
IONIZING RADIATIONS
NEBULAE
RADIATIONS
SPACE
SPECTRA
X RADIATION
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources