Search

Since 1987 we have been observing long-period WR binaries about once every two months with the 1.6m telescope at Observatoire du mont Mégantic. The spectra cover the range λλ ∼ 4000—6000Â with 2-pixel resolution (∼2.5Â) and S/N ∼ 500 in the strongest line-peaks. We present a new orbit obtained from several lines in the WC7 and the O4—5 components of the binary system HD 193793 (WR140) and discuss emission-line variability especially in the 2—3 month interval around periastron.