Physics – Optics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..171w&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 171-173, 175-181.
Physics
Optics
89
Astronomical Spectroscopy, Emission Spectra, Hercules Nova, Nebulae, Stellar Envelopes, Abundance, Balmer Series, Cassegrain Optics, Forbidden Bands, Ionized Gases
Scientific paper
Spectral scans have been obtained of different regions of the extended nova shell surrounding DQ Her, using an intensified Reticon detector. The spectra show unusually strong recombination lines of ionized carbon, nitrogen, and oxygen, which indicate enhancements of CNO with respect to H over solar values of roughly a factor of 100 in parts of the shell. In addition, a strong broad emission feature at 3644-A is identified as the Balmer continuum, formed at a very low temperature (not exceeding about 500 K). Most of the hydrogen emission and CNO recombination lines originate in the cold ionized gas. However, forbidden lines of N II and O II are also observed which indicate the presence of a hotter component of gas.
Hege Keith E.
Kopriva D. A.
Moore Robert L.
Williams Robert E.
Woolf Nancy J.
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