Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990osuc.rept.....f&link_type=abstract
Semiannual Report Ohio State Univ., Columbus. Dept. of Astronomy.
Astronomy and Astrophysics
Astronomy
Planetary Nebulae, Stellar Composition, Stellar Evolution, Stellar Mass Ejection, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra, Abundance, Astronomical Models, Electron Energy, Neon, Nitrogen, Novae, Photoionization, Ultraviolet Spectroscopy
Scientific paper
Optical spectrophotometry of PW Vulpeculae (Nova Vul 1984 no. 1) is combined with ultraviolet data to estimate electron temperatures, densities, and abundances in the ejecta of this slow classical nova. The reddening, distance, and evolution of the ultraviolet spectrum are also discussed. Abundances are nearly solar, with the exception of Nitrogen, which is substantially higher. Although Neon has been reported to be enhanced in several novae, it does not seem to be the case for PW Vul. Photoionization model calculations are presented of the ejecta that give a reasonable match of the observed emission spectrum. A strong featureless continuum shows that very hot, presumably shock heated, gas plays a major role in determining the energetics of this nova. Emission from this hot gas is responsible for the ionization of the nebular gas. A calculation of the masses of both the hot coronal gas and the cooler nebular gas shows that the former may account for most of the mass of the ejecta.
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