Distances of Galactic WC stars from emission-line fluxes and a quantification of the WC classification

Details Distances of Galactic WC stars from emission-line fluxes and a quantification of the WC classification Distances of Galactic WC stars from emission-line fluxes and a quantification of the WC classification

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..229s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, July 20, 1990, p. 229-239. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

100

Emission Spectra, Line Spectra, Stellar Luminosity, Stellar Spectra, Wolf-Rayet Stars, Carbon, Classifications, Distance, Flux Density, Milky Way Galaxy, Open Clusters, Stellar Color

Scientific paper

The extent to which later-type WC stars in the Galaxy show constant flux in the carbon lines is assessed. It is found the the WC stars are an extremely 'well-behaved' sequence in terms of quantitative spectroscopic properties. The two classification parameters are closely correlated with a scatter of the order of uncertainty. There appear to be natural breaks in the sequence between subclasses, except between WC5 and 6. The classification is quantified using the C IV 5808 A/C III 5696 A ratio as the principal defining parameter for WC7-9 stars and the C III 5696 A/O V 5590 A ratio as the principal defining parameter for WC4-6 stars. Preliminary calibration of the line fluxes indicate that the flux of C IV 5808 A in Galactic WC stars is constant at F(0) 5808 = -log F(0)(5808) = 8.1 at 1 kpc for subclasses WC5-7. The intrinsic line flux ratio C(0) = log f(0)(5808/4650) is a smooth function of subclass number, decreasing from -0.22 dex for WC4 stars to -0.56 dex for WC9 stars.

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