Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..425m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 2, Jan. 1992, p. 425-430. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
9
Binary Stars, Radial Velocity, Stellar Spectra, Wolf-Rayet Stars, Gravitational Collapse, Stellar Evolution
Scientific paper
Previous searches of WR + c binaries have concentrated on the narrow-line WRL stars, whose radial velocities (RV) and hence orbits can in principle be measured more precisely than for broad-line WRE stars. This investigation extends the search for WR + c systems to WRE stars, which are expected to have larger RV amplitudes because of their smaller masses compared to WRL stars. Negative RV results for 2 WCE and 2 WNE stars presented here, combined with previous searches, are mildly at odds with the number of second-phase WR binaries expected (about 15-20 percent) among a random sample of Galactic solar-neighborhood WR stars. Among the 51 WR stars brighter than v = 11 mag, the best WR + c candidates are still EZ CMa and possibly HD 197406, although even these are not compelling.
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