Other
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...276l..17g&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 276, Jan. 1, 1984, p. L17-L19. Research supported b
Other
7
Astronomical Spectroscopy, Binary Stars, Periodic Variations, Visible Spectrum, X Ray Sources, Absorption Spectra, Power Spectra, Radial Velocity
Scientific paper
An examination is conducted of optical spectra of HDE 226868 for evidence of the recently discovered 294 day X-ray and light period. Power spectra of the radial velocity residuals indicate no periodic signals with semiamplitude K greater than 10 km/s (99 percent confidence level) in the range 2-2000 days. The power at the 294 day period and several other related periods is well below this limit. A search was conducted for absorption-line depth variations which might result from the 294 day modulation of an extra continuum light source in the system with inconclusive results. The mass of a hypothetical third body, orbiting with a 294 day period, must be less than 1.4 solar masses. The 294 day period is significantly shorter than the spin precessional cycle predicted for HDE 226868.
Bolton Charles T.
Gies Douglas R.
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