On Wolf-Rayet stars with unshifted absorption lines

Details On Wolf-Rayet stars with unshifted absorption lines On Wolf-Rayet stars with unshifted absorption lines

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1392m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, June 1986, p. 1392-1399. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

43

Absorption Spectra, Companion Stars, O Stars, Stellar Orbits, Stellar Spectra, Wolf-Rayet Stars, Balmer Series, Interferometry, Radial Velocity, Speckle Patterns

Scientific paper

The authors examine a sample of 16 galactic Wolf-Rayet stars that exhibit unshifted absorption lines, but for which orbital motion involving the WR star and an O-type companion is either unknown or thought to be absent. If all of these are binaries, this would increase the estimate of the binary frequency for WR stars by about 10%. Speckle interferometry of three bright non-WNL+abs stars in Cygnus fails to reveal any astrometric companions down to a separation of 0.05arcsec. Thus, either the absorption lines are intrinsic to the WR star in these three cases or, more likely, they arise in a bound companion. The search for wide spectroscopic orbits for WR 137 and the WN3+abs star WR 3 is re-examined.

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