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The determination of the masses of Magellanic Cloud planetary nebulae using [O II] doublet ratio electron densities

BARLOW, MJ; (1987) The determination of the masses of Magellanic Cloud planetary nebulae using [O II] doublet ratio electron densities. Monthly Notices of the Royal Astronomical Society , 227 (1) pp. 161-183. 10.1093/mnras/227.1.161. Green open access

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Abstract

Spectrophotometric data, including [O II] 3726, 3729 Å doublet ratios, are presented for 32 planetary nebulae (PN) in the Magellanic Clouds. It is argued that the electron densities derived from these ratios provide a much better diagnostic for the determination of nebular masses than previously assumed. The 32 PN are classified as either Type I or else as optically thick or optically thin in the hydrogen Lyman continuum. The optically thick PN are found to all have electron densities greater than 6000 cm –3 , while the optically thin PN all have electron densities below 5000 cm –3. The optically thin PN show a range of only a factor of 2.0 in their derived masses, and have a mean ionized mass of 0.27±0.06M⊙⁠. The absolute Hβ fluxes of the optically thick nebulae show a range of only a factor of 1.8. The application of these results to Galactic PN would yield distances which are generally larger than those previously estimated. A method of distance determination is proposed for optically thin PN that uses integrated nebular [O II] electron densities rather than angular diameters.

Type: Article
Title: The determination of the masses of Magellanic Cloud planetary nebulae using [O II] doublet ratio electron densities
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/227.1.161
Publisher version: https://doi.org/10.1093/mnras/227.1.161
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096220
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