Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.170..533s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 170, Mar. 1975, p. 533-540.
Astronomy and Astrophysics
Astronomy
21
Abundance, Carbon Isotopes, Hercules Nova, Nitrogen Isotopes, Stellar Spectra, Absorption Spectra, Astronomical Models, Cyanides, Hydrogen, Line Spectra, Spectrum Analysis, Stellar Envelopes, Stellar Evolution, Thermonuclear Reactions, White Dwarf Stars
Scientific paper
Spectra of Nova Herculis 1934 taken during an episode of intense CN absorption are analyzed to determine the isotopic abundance ratios of C12/C13 and N14/N15. Synthetic spectrum analysis, based on the wavelengths, excitation potentials, and oscillator strengths for the CN lines, and radial velocity measurements indicate that C(12)N(14) was the dominant species in the Nova, and that the minimum abundance limit for C12/C13 is about 1.5, while the minimum for N14/N15 is about 2. The results are compared with predictions based on models of thermonuclear runaways in hydrogen-rich envelopes of white dwarfs. It is noted that the nova material may have been contaminated with C13-rich material prior to or during the eruption. Possible causes of this isotope enrichment are presented.
Lambert David L.
Sneden Chistopher
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