Low-excitation planetary nebulas

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Emission Spectra, Planetary Nebulae, Spectrophotometry, Stellar Temperature, Electron Density (Concentration), Interstellar Extinction, Ionized Gases, Stellar Luminosity

Scientific paper

The results are given of spectrophotometric investigation of three
objects: M 1 - 46, PC 12, and M 1 - 39. The emission line intensities
and the electron densities are determined, and the effective
temperatures of the central stars are estimated.

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