Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..284m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, July 15, 1991, p. 284-292. SERC-supported research
Astronomy and Astrophysics
Astronomy
33
Astronomical Spectroscopy, Halos, Planetary Nebulae, Stellar Composition, Stellar Winds, Hydrogen, Ionized Gases, Neon, Oxygen, Stellar Evolution, Stellar Luminosity
Scientific paper
The large halo around the bright planetary nebula NGC 7662 is analyzed by means of spectroscopic observations and telescopic imaging. The spectra and composite images are obtained and used to calculate the halo's electron temperature, O/H and Ne/H ratios, and the ionized halo mass. The halo mass is less than or equal to 0.19 solar mass, the apparent O/H and Ne/H ratios are lower by a factor of two in the halo than in the bright core, and the electron temperature is found to be higher in the halo. The data for the halo are compared to those for NGC 6543 and NGC 6826, and the halos are described as shocked filamentary regions. Halo emission is not related to rapid decreases in the central stars' luminosities, and the central star winds are theorized to contribute to halo energy. The penetration of energy from the winds is explained by means of two scenarios: a slow shock which compresses the energy; and high-velocity electrons and ions which enter and heat the gas.
Clegg Robin E. S.
Harrington Patrick J.
Middlemass D.
Walsh Jonathan R.
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