Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....92....1m&link_type=abstract
Astronomy and Astrophysics, vol. 92, no. 1-2, Dec. 1980, p. 1-5. Research supported by the Swiss National Science Foundation an
Astronomy and Astrophysics
Astrophysics
14
Cepheid Variables, Planetary Nebulae, Radial Velocity, Stellar Evolution, Stellar Oscillations, Stellar Rotation, Astrometry, Periodic Variations, Secular Variations, Stellar Spectra, Stellar Spectrophotometry, Supergiant Stars, Velocity Measurement
Scientific paper
The radial velocity curve of FG Sge is established with 80 radial velocities measured from 1977 to 1979 using the spectrophotometer CORAVEL. The mean period is 120 plus or minus 10 days, the mean amplitude and velocity being solar radii, 3.0 plus or minus 0.2 km/s and 37.5 plus or minus 0.1 km/s. The comparison with the simultaneous photometric variations shows that the luminosity variation happens nearly in phase with the radius variation. Using Wesselink's method, the value of the radius is estimated to about 140 solar radii, which leads to a pulsation mass of about 1 solar mass and a distance of about 2.5 Kpc. The mean broadening of the lines, deduced from the width of the correlation dip of FG Sge, would require a low rotation velocity.
Acker Agnés
Mayor Marcel
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