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2008ApJ...683..449B - Astrophys. J., 683, 449-465 (2008/August-2)

Time-resolved FUSE spectroscopy of the LMC WC + O binaries Br 22 and Br 32.


Abstract (from CDS):

Using the Far Ultraviolet Spectroscopic Explorer satellite, we obtained series of spectra for two of the three known WC + O binaries in the LMC, Br 22, and Br 32 (HD 36521). Compared to Br 22, we detect a higher ratio of C IV to He II lines in Br 32, which could indicate a more advanced evolutionary stage for the latter. The orbit of the O star in Br 32 has been determined from its P V absorption lines. We find that continuum fluxes in both systems are substantially diluted by a third-light source. The maximum extension of the black absorption troughs in P Cygni profiles provides the terminal velocities of the WC winds: 3775±125 km/s for Br 22 and 4400±150 km/s for Br 32. From the phase-dependent displacements of the blue absorption edges of prominent emission lines we estimate the half-opening angles of the wind-wind collision zones and their Coriolis deflections. In both binaries we fitted, via iterative procedure, the phase-dependent changes in the O VI λ1032-1037 and C III λ1175 profiles as a function of the wind, stellar, and orbital parameters. This allowed us to isolate the excess emission produced in the wind-wind collision zone and reproduce profile changes caused by atmospheric eclipses. A strong extra emission component is observed in Br 22 (P=14.9 days), while it is negligible in Br 32 (P=1.9 days).

Abstract Copyright:

Journal keyword(s): Line: Profiles - stars: individual (Br 22) - stars: individual (Br 32) - Stars: Wolf-Rayet - Techniques: Spectroscopic

Simbad objects: 18

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