Planetary Nebulae II. Electron Temperatures and Electron Densities

Details Planetary Nebulae II. Electron Temperatures and Electron Densities Planetary Nebulae II. Electron Temperatures and Electron Densities

Jun 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971bott....6...29p&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 6, pp. 29-37 (1971) (http://www.astroscu.unam.mx/~bott/)

Astronomy and Astrophysics

Astronomy

99

Planetary Nebulae, Photometry, Atomic Processes

Scientific paper

The electron temperature is obtained for thirteen planetary nebulae by means of forbidden lines of oxygen doubly ionized and nitrogen singly ionized. These temperatures range from 9000 to 15300°K. From the ratio of the Balmer continuum to the Balmer emission line intensities, temperatures in the 7000 to 8000°K range are derived for NGC 6572, IC 418, and NGC 7009. Each method yields a different temperature for a given object; this is an indication of the presence of spatial temperature fluctuations. Electron densities for these objects are derived by means of auroral to nebular line intensity ratios of O II and from transauroral to nebular line intensity ratios of S II. These ratios yield densities higher than those obtained from nebular line intensity ratios of the same ions. It is concluded that this effect is due to spatial density and temperature fluctuations.

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