Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304..188d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 304, May 1, 1986, p. 188-200. NSERC-supported research.
Astronomy and Astrophysics
Astronomy
63
Binary Stars, Black Holes (Astronomy), Polarimetry, Stellar Spectra, X Ray Stars, Emission Spectra, Radial Velocity, Stellar Mass, Wolf-Rayet Stars
Scientific paper
New spectroscopic and polarimetric data for the single-line spectroscopic binary HD 197406 are presented. We derive a more accurate period and mass function from an improved radial velocity orbit based on all spectroscopic measures available to date. Polarimetric observations allow us to determine (1) that the inclination of the orbital plane i ≍ 67° , combined with the mass function f(m) = 0.28 Msun, yields a mass of 12.4 Msun for the unseen companion if we suppose MWN7 = 60 Msun for the Wolf-Rayet primary, and (2) that the scattering material responsible for the intrinsic polarization variations is not located preferentially near the line joining the two stars. This system is shown to be a runaway, and in many respects resembles the OB supergiant + black hole (BH) binary HDE 226868 (Cyg X-1), except that HD 197406 is not an X-ray source. If the unseen companion of HD 197406 is a BH, the recoil from a preceding supernova explosion may be the cause of its present runaway status. Alternatively, whether HD 197406 possesses a BH or a normal star companion, we cannot exclude a priori the possibility that the binary was slung out of a protocluster during its rapid contraction phase.
Bastien Pierre
Drissen Laurent
Lamontagne Robert
Moffat Anthony F. J.
Seguin M.
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