The orbit of the Wolf-Rayet spectroscopic binary HD 193576, V444 Cygni

Details The orbit of the Wolf-Rayet spectroscopic binary HD 193576, V444 Cygni The orbit of the Wolf-Rayet spectroscopic binary HD 193576, V444 Cygni

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100..741u&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, June 1988, p. 741-748. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

17

Eclipsing Binary Stars, Radial Velocity, Stellar Orbits, Stellar Spectra, Wolf-Rayet Stars, Cygnus Constellation, O Stars, Stellar Mass

Scientific paper

The authors have observed the binary system HD 193576, V444 Cygni (WN5+O6), for radial velocity in the yellow-green spectral range and have solved for the three parameters T0, γ, and K for a circular orbit. From He II λ5411 they find γW-R = +100±8 km s-1, and KW-R = 370±12 km s-1, while from N IV λ5203 the systemic velocity is -40±12 km s-1 and KW-R = 337±18 km s-1; γ0 = +22±5 km s-1, K0 = 112±8 km s-1. From the He II and O III lines they find larger minimum masses than previously found, namely, 11.3 and 37.5 M_sun; for the W-R and the O stars, respectively, but these values are suspect. From the N IV and O III lines they find 9.8 and 29.6 M_sun;, respectively.

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