Published March 1990
| Version v1
Journal article
Molecular envelope of the planetary nebula NGC 7027
Creators
- 1. Beijing Normal Univ. (China)
- 2. Tokyo Univ. (Japan)
- 3. Paris, Observatoire, Meudon (France)
- 4. Nobeyama Radio Observatory, Minamimaki (Japan)
Description
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
Additional details
Publishing Information
- Journal Title
- Astrophysical Journal
- Journal Volume
- 351
- Series
- Astrophys. J.
- Journal Page Range
- 522-529
- ISSN
- 0004-637X
- CODEN
- ASJOA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 21055689
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- CHEMICAL COMPOSITION; COOLING; COSMIC GASES; ELEMENT ABUNDANCE; EMISSION SPECTRA; HEAT TRANSFER; HEATING; INTERSTELLAR SPACE; IONIZATION; MASS TRANSFER; MATHEMATICAL MODELS; MOLECULES; MORPHOLOGICAL CHANGES; PLANETARY NEBULAE; SOFT X RADIATION
- Descriptors DEC
- ELECTROMAGNETIC RADIATION; ENERGY TRANSFER; FLUIDS; GASES; IONIZING RADIATIONS; NEBULAE; QUANTITY RATIO; RADIATIONS; SPACE; SPECTRA; X RADIATION