Statistics – Computation
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..193s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Jan. 15, 1991, p. 193-216.
Statistics
Computation
46
Abundance, Ionized Gases, Novae, Recombination Coefficient, Stellar Envelopes, Atomic Collisions, Emission Spectra, Forbidden Bands, Helium, Hydrogen, Oxygen Spectra
Scientific paper
Capture-collision-cascade models developed for calculating recombination spectra of H I, He I and CNO ions from a neutral to a doubly ionized state are described. The method of solution closely follows the treatment of Brocklehurst. The models for complex atoms use LS coupling mainly, although for small principal quantum numbers other coupling schemes have also been used. The results of computations at low temperatures, i.e. between 312.5 and 2500 K, are presented. Forbidden-line fluxes, formed by recombination, are also listed. The H I results supplement the work of Martin (1989) and Brocklehurst (1972). The data are then used to check the line identifications in the spectra of the cool nova shells of DQ Her, T Aur and CP Pup. This work confirms that these nova shells are metal enriched, but the enhancements are less extreme then suggested in the original analyses.
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