Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phr...311..371s&link_type=abstract
Physics Reports, Vol. 311, No. 3 - 5, p. 371 - 381
Physics
26
Novae: Outbursts, Novae: Element Abundances
Scientific paper
The nova outburst is a consequence of the accretion of hydrogen-rich material onto a white dwarf in a close binary system and observations show that the accreting material must have mixed with core material at some phase of the outburst. Abundance determinations of nova ejecta show that the core material is either carbon and oxygen or oxygen, neon, and magnesium. The author reports on the methods and results of a project to determine the ejecta abundances for a number of Galactic and LMC novae using combined optical and ultraviolet data. The abundance determinations also provide a value for amount of mass ejected in the outburst. There are large discrepancies between the observed and predicted values of the ejecta mass in that the observed ejecta masses are much larger than predicted for both carbon-oxygen and oxygen-neon-magnesium novae. The author also reviews the X-ray observations and presents new evolutionary calculations done to try to understand the missing ejecta mass problem and suggests a possible solution to this problem.
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