The Wolf-Rayet Binary V444 Cygni under the Spectroscopic Microscope. II. Physical Parameters of the Wolf-Rayet Wind and the Zone of Wind Collision

Details The Wolf-Rayet Binary V444 Cygni under the Spectroscopic Microscope. II. Physical Parameters of the Wolf-Rayet Wind and the Zone of Wind Collision The Wolf-Rayet Binary V444 Cygni under the Spectroscopic Microscope. II. Physical Parameters of the Wolf-Rayet Wind and the Zone of Wind Collision

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...485..826m&link_type=abstract

Astrophysical Journal v.485, p.826

Astronomy and Astrophysics

Astronomy

30

Stars: Binaries: Eclipsing, Stars: Individual Constellation Name: V444 Cygni, Stars: Mass Loss, Stars: Wolf-Rayet

Scientific paper

New, extensive, high signal-to-noise, phase-dependent optical spectroscopy, along with simultaneous narrowband continuum photometry, leads to restrictions on the electron temperature and density in the wind close to the Wolf-Rayet component of the eclipsing binary V444 Cygni (WN5 + O6 V--III). Detailed study of the phase dependence of the equivalent widths and line profiles of the W-R star reveals significant ionization stratification in the W-R wind. Our previous discussion of the wind-wind collision effects on He I lines is extended to He II lines. We find that (1) the wind-wind collision zone is detached from the surface of the O star; (2) the radiation field of the O star does not inhibit the initial acceleration of the W-R wind; however, it does brake the flow just prior to entrance into the collision zone; (3) the shocked gas experiences rapid, tcool <~ (2--4) x 104 s, and profound cooling via radiative losses, leading to high compression of the postshock gas.

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