Heavy element abundances of Nova Cygni 1975

Details Heavy element abundances of Nova Cygni 1975 Heavy element abundances of Nova Cygni 1975

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226..172f&link_type=abstract

Astrophysical Journal, Part 1, vol. 226, Nov. 15, 1978, p. 172-185.

Astronomy and Astrophysics

Astrophysics

94

Abundance, Emission Spectra, Heavy Elements, Novae, Carbon, Electron Density (Concentration), Forbidden Bands, Iron, Neon, Nitrogen, Oxygen, Stellar Models

Scientific paper

Observations of the nebular phase of the outburst of Nova Cygni 1975 are analyzed to measure the abundances of several heavy elements. An analytical procedure is used to derive the electron density and temperature from the emission line intensities of forbidden O III, forbidden Ne III, and He I observed between days 40 and 120. These physical conditions are used to derive the abundances. It is found that Fe has approximately a solar abundance, whereas C, N, O, and Ne are enhanced by factors of about 20 to 100. The enhanced abundance of neon was theoretically unexpected. The derived physical conditions and line intensities are compared with predictions of an equilibrium photoionization model. The model successfully predicts the intensities of He I, forbidden O III, and forbidden Ne III; but it underestimates the strengths of forbidden Ne V and forbidden Fe VII, which may originate in a mechanically heated 'subcoronal' line region.

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