A spectrographic search for colliding stellar winds in O-Type close binary systems V. HD 149404
We present new emission line spectra and an analysis of the mass outflow for the massive binary, HD 149404.
close binary systems↗
Engineering topics
Wiemker, R.
Publications and source records attributed to Wiemker, R..
HD 53975: An O-type spectroscopic binary with a large mass ratio
We present radial velocities and line profiles of the O-type star HD 53975, which we find to be a spectroscopic binary with a period of 6.0173 days. Although there are no obvious signatures of the secondary in the line profiles, we have used the merit function of Shafter et al. (1980) to show that a secondary component is present in lines found in B-type spectra. We have compared the observed merit functions with merit functions for model profiles constructed assuming a main-sequence secondary, and this comparison consistently indicates a companion with a mass ratio of q = M(sub 2)/M(sub 1) = 0.23 +/- 0.04 and a magnitude difference Delta m = 3.3 +/- 0.4. We present a tomographic reconstruction of the spectrum of the secondary for these parameters. We suggest that other large mass ratio binaries may be found among the O stars when observed with high-resolution and high signal-to-noise ratio spectroscopy.
Gies, D. R.↗