Distances for galactic planetary nebulae using mean forbidden O II doublet ratio electron densities

Details Distances for galactic planetary nebulae using mean forbidden O II doublet ratio electron densities Distances for galactic planetary nebulae using mean forbidden O II doublet ratio electron densities

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..317k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 2, July 15, 1992, p. 317-339.

Other

48

Astrometry, Distance, Electron Density (Concentration), Planetary Nebulae, Calibrating, Magellanic Clouds, Optical Thickness, Stellar Spectra, Stellar Spectrophotometry

Scientific paper

Forbidden O II 3726, 3729-A double ratios and electron densities are presented for 68 galactic PN. For 45 of the objects, the doublet ratios represent integrations over the whole of the nebula. Calibrations recently derived from the Magellanic Cloud PN are used to derive distances for the majority of the nebulae. The typical forbidden O II density at the transition point between an optically thick and thin nebula is 4500/cu cm. An extensive comparison is made between the distances derived and previously published distances and distance scales. It is shown that the present distances, based on Magellanic Cloud calibrations, yield consistency with independent distance estimates. They also exhibit much greater self-consistency between central star masses derived from luminosity vs Teff comparisons on the one hand, and from absolute magnitude vs evolutionary age comparisons on the other. For the PN in this sample, rms electron densities, filling factors, and absolute radii are also derived.

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