Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984baicz..35..164h&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 35, no. 3, 1984, p. 164-179.
Astronomy and Astrophysics
Astronomy
35
B Stars, Eclipsing Binary Stars, Ephemerides, Orbital Elements, Radial Velocity, Stellar Motions, H Lines, Secular Variations, Shell Stars, Stellar Models, Stellar Spectra, Variable Stars
Scientific paper
Published 20th-century observations of the periodic and long-term H I radial-velocity variation of Zeta Tau are compiled in tables and graphs and analyzed. The ephemeris is calculated as T(primary eclipse) = JD 2,415,549.638 + 132.9735 d x E, and the He I velocities are found to be in phase with the H I velocities and have a similar amplitude. The binary parameters are estimated, the most likely values being mass = 11.2 solar mass, spectral type = Be le. and Roche-lobe radius = 147 solar radius for the primary and 1.4 solar mass, G8 and 53 solar radius, respectively, for the secondary.
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