Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...75..407m&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 75, Feb. 1991, p. 407-424.
Astronomy and Astrophysics
Astrophysics
99
Balmer Series, H Beta Line, Magellanic Clouds, Planetary Nebulae, Visible Spectrum, Asymptotic Giant Branch Stars, Electron Density (Concentration), Stellar Evolution, Stellar Mass
Scientific paper
Optical spectroscopy in the range 3300-7400 A is presented for a total of 30 planetary nebulae in the LMC and 11 in the SMC, with measurements of line intensities down to about 1 percent of H-beta. Reddening estimates from Balmer line ratios have been determined, and the line intensities dereddened accordingly. Nebular forbidden O III electron temperatures and, where measurable, forbidden N II temperatures and forbidden S II densities are given. Forbidden O II electron densities are recalculated using appropriate electron temperatures. The forbidden S II and forbidden O II electron densities are found to correlate well. A number of spectra exhibit interesting spectral features, including symbiotic-type profiles, unidentified emission lines, and nonsimple Balmer decrements. These objects are discussed in some detail. Zanstra temperatures are derived for a total of 25 objects possessing detectable stellar continua.
Dopita Michael A.
Meatheringham Stephen J.
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