The central star and ionization state of the envelope of Nova Delphini 1967

Astronomy and Astrophysics – Astrophysics

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Electron Density (Concentration), Electron Energy, Novae, Stellar Envelopes, Stellar Models, Forbidden Transitions, Gas Ionization, Optical Thickness

Scientific paper

The electron density and temperature of the circumstellar envelope of Nova Delphini have been recalculated after correction of the observed flux of the forbidden lines for supplementary reddening due to the envelope. Results differ only slightly from those previously reported (Malakpur, 1973). The radius of the Nova was determined to be 8.49, 4.32, and 1.18 times ten to the tenth cm in 1968, 1969, and 1970, respectively. The calculated temperatures for these years are 103,000 K, 115,000 K, and 121,000 K. The optical depth of the envelope in the Lyman continuum has been found to be of the order of 10 during the nebular stage. The electron temperature of the inner portion of the envelope is at least three times greater than that of the outer portion. The increase of electron temperature at the interior of the envelope may be explained by the weakening of the cooling effect of ions of different elements with increasing degree of ionization.

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