Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26as...58..529i&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 58, Dec. 1984, p. 529-536. In French.
Astronomy and Astrophysics
Astrophysics
14
Binary Stars, Cepheid Variables, Orbital Elements, Radial Velocity, Radii, Fourier Series, Tables (Data), Ubv Spectra
Scientific paper
The classical Cepheid SU Cyg is characterized on the basis of 89 radial velocities measured with the Coravel photoelectric spectrometer on the 1-m Swiss telescope of the Observatoire de Haute Provence from May, 1979, to June, 1982. The data are presented in tables and graphs and combined with the UBV photometric data of Szabados (1977), Fernie (1979), and Moffet and Barnes (1980) to estimate the radius of the system by the technique of Wesselink (1946). Parameters calculated include period = 549.20 + or - 0.03 d, K = 30.4 + or - 0.2 km/s, gamma = -21.2 + or - 0.1 km/s, e = 0.349 + or - 0.004, omega = 221.8 + or - 1.2 deg, f(m) = 1.32 + or - 0.03 solar mass, and Cepheid radius = 43.9 solar radii.
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