## Circular, Volume 443 |

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### Common terms and phrases

apsidal line average central density axial rotation Bethe's binary systems Cassiopeiae central condensation chemical composition close binaries close to unity column components of binary components of close contain less hydrogen corresponding Cygni denotes density distribution density of main derived Dugan eclipsing binaries eclipsing system effective temperature elliptical orbits equal or close expressed in terms family of models fission Herculis higher central temperature hydrogen content investigations Keplerian angular velocity Kuiper light curve luminosities main sequence stars mass and central mass-luminosity relation mass-ratios equal mean density mean Keplerian angular mean molecular weight mean solar density O.ZO observational data orbital eccentricity pc/p periastron passage Photometric elements Photometric orbit ponents present quantum mechanical radii-ratios radius rate of apsidal ratio real stars recently Russell Russell-Vogt theorem Sagittae solar mass specified spectroscopic binaries Spectroscopic orbit spectrum standard model statistically at least Sterne Table taken as unity theoretical tidal tidal force Trumpler's stars values