Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997azh....74..710l&link_type=abstract
Astronomicheskij Zhurnal, vol. 74, p. 710
Astronomy and Astrophysics
Astronomy
1
Binary Stars, Stellar Orbits, Orbital Elements, Helium, G Stars, Stellar Spectra, Radial Velocity, Stellar Systems, Ccd Cameras
Scientific paper
The radial velocities V(r) of the components of the binary system Omicron Per were measured from high-resolution, high SNR CCD spectra. These data and all of the previously published V(r) determinations were used to refine the orbital elements. The following effective temperatures and surface gravities were obtained: Teff = 22,700 +/- 1500 K, lg(g) = 3.4 +/- 0.2 for the primary component (star A) and Teff = 21,000 +/- 1500 K, lg(g) = 4.0 +/- 0.2 for the secondary component (star B). The helium abundance derived from blue (less than 5000 A) He I lines turned out to be enhanced in component A (He/H = 0.18 +/- 0.01) and nearly normal in component B (He/H = 0.11 +/- 0.01). The relative ages of the components suggest that the primary is near completion of the main-sequence phase, while the secondary is only halfway through this phase. These data together with our previous results for binary early B stars lend support to the age dependence of the helium abundance. This dependence can be explained by mixing in the main-sequence phase. It is concluded that binarity strongly affects the mixing pattern.
Lyubimkov Leonid S.
Rachkovskaya Tamara M.
Rostopchin Sergey I.
Tarasov Anatolii E.
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