A photoionization model analysis of the ONeMg nova QU Vul

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Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Abundances, Chemical Composition

Scientific paper

This paper presents a new analysis of the moderately fast ONeMg nova QU Vul 1984 using published ultraviolet, optical, infrared and radio observations. The technique uses an optimization code in combination with Cloudy photoionization models to fit the emission line spectra obtained at different epochs during the nebular phase of the outburst. Previous studies of QU Vul yielded considerable differences in the derived elemental abundances, ejected mass and distance. This analysis, which is consistent with all the available data and over multiple epochs, generally finds the lowest abundance enhancements of the previous studies. The distance most compatible with the all of the available distance determinations is 2.4 kpc. At this distance, the ejected mass is extremely high with a value of ~ 6 × 10-4 Msolar. Coupling these factors with the long lightcurve decay time and nuclear burning timescale implies that the outburst occurred on a low mass ONeMg white dwarf.

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