Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398..651s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 398, no. 2, p. 651-664.
Astronomy and Astrophysics
Astrophysics
53
Novae, Stellar Envelopes, Stellar Mass Ejection, Stellar Spectra, White Dwarf Stars, Abundance, Chemical Evolution, Stellar Composition, Stellar Spectrophotometry, Ultraviolet Spectra
Scientific paper
We have combined ground-based optical and satellite ultraviolet spectrophotometric data to study the ejected shell of Nova Vulpecula 1984 No. 2 (QU Vul). Substantial uncertainties concerning the nature of the ionizing continuum, and the role played by density inhomogeneities, now exist. Because of these uncertainties, the chemical composition is deduced from emission-line pairs chosen to minimize the effects of variations in temperature, density, and ionization. We find that the chemical composition of the ejected shell show enhancements of several elements relative to hydrogen, namely, He, N, O, Ne, Mg, Al, and Si, as is expected for an outburst occurring on an ONeMg white dwarf. It is also shown that QU Vul ejected a large amount of aluminum into the interstellar medium, and it is estimated that only a small fraction of slow novae of this type can account for the observed abundance of aluminum in the Galaxy.
Ferland Gary J.
Kenyon Scott. J.
Saizar Pedro
Sparks Warren M.
Starrfield Sumner
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