The Ionization Structure of Planetary Nebulae: IV. Optical Thicknesses of the Nebulae and Temperatures of the Central Stars
Open Access
- 1 April 1966
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 132 (1) , 15-33
- https://doi.org/10.1093/mnras/132.1.15
Abstract
Of forty-seven planetaries for which measurements have been made of angular radii, H β fluxes, relative line intensities and central star magnitudes, forty-two are shown to satisfy criteria for complete absorption in the continua of H I , of He I or of He II . For these forty-two nebulae values are obtained for the central star temperatures T , for the luminosity parameter Λ = L / r2L⊙ where r is the distance, and for a parameter η which provides a measure of the completeness of absorption in the H I Lyman continuum. It is found that for thirteen of them absorption in the Lyman continuum is complete, or practically complete. The star temperatures range from 2.8 × 10 4 °K to 1.8 × 10 6 °K.Keywords
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