Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..169b&link_type=abstract
Astronomy Letters, Volume 25, Issue 3, March 1999, pp.169-178
Astronomy and Astrophysics
Astronomy
4
Scientific paper
The results of fifteen-year-long observations of optical spectra and three-color BVR photoelectric photometry of the runaway star HD 108 are presented. We detected periodic variations in the radial velocities of absorption and emission lines and optical variability on a long time scale (several years). Our search for periodicities in the radial-velocity variations of all available spectroscopic observations revealed the period P = 1627.6 days, which is most likely a result of the binary nature of the star. Long-term optical light variations are accompanied by color variations in the star. The motion of the star in color-magnitude diagrams may be due mainly to a change of the Paschen continuum in the stellar envelope. The enhanced absorption in the continuum and the reddening of the star in 1996-1997 are assumed to be produced by the commenced envelope ejection. The detected long-term photometric variability may be a direct result of the influence of the massive unseen secondary component on the primary optical component.
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