Nature of the Wolf-Rayet component of the binary system V444 Cygni

Details Nature of the Wolf-Rayet component of the binary system V444 Cygni Nature of the Wolf-Rayet component of the binary system V444 Cygni

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976sva....19..727c&link_type=abstract

(Astronomicheskii Zhurnal, vol. 52, Nov.-Dec. 1975, p. 1214-1225.) Soviet Astronomy, vol. 19, no. 6, 1976, p. 727-734. Translat

Astronomy and Astrophysics

Astronomy

16

Eclipsing Binary Stars, Hot Stars, Light Curve, Stellar Atmospheres, Wolf-Rayet Stars, Brightness Temperature, Light Curve, Stellar Envelopes, Stellar Evolution, Stellar Luminosity, Stellar Mass Ejection

Scientific paper

Narrow-band light curves of the V444 Cyg system are used to reconstruct the disk structure of the Wolf-Rayet (WR) star in different wavelengths of the continuum between 4244 and 7512 A. An empirical distribution of the color and brightness temperatures across the disk shows that the temperature of the core surface exceeds 70,000 to 100,000 K, the color temperature of the shell emission is about 10,000 K, and the color temperature of the entire disk is 20,000 K. The electron density at the core surface is estimated along with the core radius and the mass flow rate. It is shown that the bolometric luminosity is nearly critical, the main cause of mass flow is light pressure, and the emission lines are excited primarily by UV radiation from the core. It is concluded that this WR star was apparently formed as a result of mass exchange in the binary system and is presently a helium remnant in the final evolutionary stage after the main sequence. The possibility that the star may ultimately become a neutron star or black hole is not excluded.

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