C/He abundances in WC stars

Details C/He abundances in WC stars C/He abundances in WC stars

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.230..511s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 230, Feb. 15, 1988, p. 511-534.

Astronomy and Astrophysics

Astronomy

76

Abundance, Carbon Stars, Helium, Stellar Spectra, Wolf-Rayet Stars, Emission Spectra, Infrared Spectra, Lyman Alpha Radiation, Stellar Spectrophotometry, Thermodynamic Equilibrium

Scientific paper

Recombination theory has been used to determine the C/He abundances in 17 southern WC stars from spectra in the H and K bands. An LTE treatment of C II provides C/He values in the 0.04-0.3 range, by number, and maximum allowance for possible non-LTE effects yields values in the 0.1-0.7 range, by number. C/He is shown to decrease from WC4 to WC7. The ionization balance is found to be lower than in previous reports. He(+)/He(2+) values are between 2.6 and 3.0 for WC5-8 stars, increasing to 7 for WC9 stars. Continuum slopes and corrections for the emission line contributions to the H and K magnitudes are evaluated.

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